Pregnology - all about pregnancy dates & numbers
Ovulation Calendar
When am I ovulating? This ovulation calendar shows you what is going on inside your body,
and when you can expect your ovulation date, your most fertile days and when you can try
a home pregnancy test. Move over the little images to see a bigger image!
When am I ovulating? • When can I do a pregnancy test? • What's my Due date? • How far along am I? •

Your cycle

Today you are in the 1st day of your cycle.
There are 28 days to your next cycle.
You are in the menstrual phase of the cycle.
Your next ovulation will be in 13 days
Your (extra) fertile period starts in 9 in days
You may try a home pregnancy test in 26 in days


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A new cycle starts here!
Days from now Date Day of cycle Phase Days to your next cycle What's happening?
TodayWed, November 19th ,2008 1st day menstrual 28 days to your next cycle. • The menstrual phase usually lasts 3 to 5 days, but anywhere from 2 to 7 days is considered normal
1Thu, November 20th ,2008 2nd day menstrual 27 days to your next cycle. • The average blood loss during menstruation is 35 millilitres with 10–80 ml considered normal
2Fri, November 21st ,2008 3rd day menstrual 26 days to your next cycle. • Because of this blood loss, women have higher dietary requirements for iron than do males to prevent iron deficiency.
3Sat, November 22nd ,2008 4th day menstrual 25 days to your next cycle. • Many women experience uterine cramps during the menstrual phase.
4Sun, November 23rd ,2008 5th day follicular 24 days to your next cycle. • The lining of the uterus is at its most thin. Levels of estrogen and progesterone are at their lowest.
• Through the influence of a rise in follicle stimulating hormone (FSH), five to seven tertiary-stage ovarian follicles are recruited for entry into the next menstrual cycle
5Mon, November 24th ,2008 6th day follicular 23 days to your next cycle. • These follicles, that have been growing for the better part of a year in a process known as folliculogenesis, compete with each other for dominance.
6Tue, November 25th ,2008 7th day follicular 22 days to your next cycle. • Under the influence of several hormones, all but one of these follicles will undergo atresia, while one (or occasionally two) dominant follicles will continue to maturity.
7Wed, November 26th ,2008 8th day follicular 21 days to your next cycle. • Your fertility increases throughout the follicular phase
8Thu, November 27th ,2008 9th day follicular 20 days to your next cycle. • As they mature, the follicles secrete increasing amounts of estradiol, an estrogen. The estrogens that follicles secrete initiate the formation of a new layer of endometrium in the uterus. The estrogen also stimulates crypts in the cervix to produce fertile cervical mucus
• Research supports the suggestion that a bright 100W bedside lamp used on 5 consecutive nights prior to ovulation can cause reduction of long menstrual cycles.
9Fri, November 28th ,2008 10th day follicular 19 days to your next cycle. • The time needed for recruitment of the follicles and selecting the best (dominant) follicle for the ovulation causes variations in the length of the cycle.
• Normal sperm life inside a woman ranges from 1-5 days, though a pregnancy resulting from sperm life of 8 days has been documented. If you are trying for a baby, it would be a good time to try today and in the next 5 days. Because ovulation dates are different for every woman and each cycle, it is suggested that if a woman wants to conceive, the most fertile time occurs between today and the next 9 days to come.
10Sat, November 29th ,2008 11th day follicular 18 days to your next cycle. • This day (as well as the the next 3 days) is a good day to try for a baby.
11Sun, November 30th ,2008 12th day follicular 17 days to your next cycle. • When the egg has matured, it secretes enough estradiol to trigger the acute release of luteinizing hormone (LH).
12Mon, December 1st ,2008 13th day follicular 16 days to your next cycle. • In the average cycle this LH surge starts around cycle day 12 and may last 48 hours.
13Tue, December 2nd ,2008 14th day ovulation 15 days to your next cycle. • Ovulation: The release of the ovum. The egg is swept into the fallopian tube. If fertilization occurs, it will happen in the fallopian tube, today or tomorrow. (A released egg can be fertilised for up to 48 hours)
14Wed, December 3rd ,2008 15th day luteal 14 days to your next cycle. • After ovulation, the follicle which held the egg transforms into the corpus luteum. It will produce progesterone for approximately the next 2 weeks. Progesterone helps forming a lining receptive for implantation and supportive of the early pregnancy.
15Thu, December 4th ,2008 16th day luteal 13 days to your next cycle. • 24-30 hours after fertilization the first cell division (mitosis) takes place.
• Progesterone raises the body temperature to provide a fertile environment for the ovum by 0.25 °C to 0.5 °C (0.5 °F to 1.0 °F), thus women who record their basal body temperature on a daily basis will notice that they have entered the luteal phase.
16Fri, December 5th ,2008 17th day luteal 12 days to your next cycle. • If fertilization of an egg has occurred, the egg and sperm united are called a zygote. It will travel through the fallopian tube, making its way to the uterus.
17Sat, December 6th ,2008 18th day luteal 11 days to your next cycle. • If an egg is not fertilised within 24-48 hours of ovulation, the rest of the luteal phase is considered to be relatively infertile.
18Sun, December 7th ,2008 19th day luteal 10 days to your next cycle. The zygote's rapid cell division from 2 to 4 to 8 now reached 16 cells. By this day the ball of cells is called a morula.
19Mon, December 8th ,2008 20th day luteal 9 days to your next cycle.
20Tue, December 9th ,2008 21th day luteal 8 days to your next cycle. The morula's rapid cell division from 16 to 32 to 64 now reached 128 cells. A cavity is formed within the ball of cells. It is now called a blastocyst or blastula. Very soon the blastocyst will have so many cells that individual cells are no longer recognizable
21Wed, December 10th ,2008 22th day luteal 7 days to your next cycle. • A fertilized blastocyst will implant itself into the uterine. The point of implantation becomes the origin for the placenta and umbilical cord. Note that impantation can occur several today, but also several days from now...
22Thu, December 11th ,2008 23th day luteal 6 days to your next cycle. • Shortly after implantation, the growing embryo will signal its existence to the maternal system. One very early signal consists of human chorionic gonadotropin (hCG), a hormone that pregnancy tests can measure
23Fri, December 12th ,2008 24th day luteal 5 days to your next cycle. • The level of hCG is increasing, but still too low to measure with a home pregnancy test. The level will double every 2 or 3 days.
24Sat, December 13th ,2008 25th day luteal 4 days to your next cycle. • a hCG blood test may now see an increased hCG level. It is still too early for a home pregnancy test measuring the hCG in the urine test.
25Sun, December 14th ,2008 26th day luteal 3 days to your next cycle.
26Mon, December 15th ,2008 27th day luteal 2 days to your next cycle. • There is a good chance that a home pregnancy test can pick up enough hCG to confirm a pregnancy. A negative test doesn't mean you're not pregnant, there may simply not be enough hCG yet because it is to early after implantation.
27Tue, December 16th ,2008 28th day luteal 1 days to your next cycle. • if the egg is not fertilised and does not implant, the corpus luteum will disintegrate after approximately two weeks, causing the drop in progesterone levels that signals the start of menstruation and the beginning of a new cycle
A new cycle starts here!
Days from now Date Day of cycle Phase Days to your next cycle What's happening?
28Wed, December 17th ,2008 1st day menstrual 28 days to your next cycle. • The menstrual phase usually lasts 3 to 5 days, but anywhere from 2 to 7 days is considered normal
29Thu, December 18th ,2008 2nd day menstrual 27 days to your next cycle. • The average blood loss during menstruation is 35 millilitres with 10–80 ml considered normal
30Fri, December 19th ,2008 3rd day menstrual 26 days to your next cycle. • Because of this blood loss, women have higher dietary requirements for iron than do males to prevent iron deficiency.
31Sat, December 20th ,2008 4th day menstrual 25 days to your next cycle. • Many women experience uterine cramps during the menstrual phase.
32Sun, December 21st ,2008 5th day follicular 24 days to your next cycle. • The lining of the uterus is at its most thin. Levels of estrogen and progesterone are at their lowest.
• Through the influence of a rise in follicle stimulating hormone (FSH), five to seven tertiary-stage ovarian follicles are recruited for entry into the next menstrual cycle
33Mon, December 22nd ,2008 6th day follicular 23 days to your next cycle. • These follicles, that have been growing for the better part of a year in a process known as folliculogenesis, compete with each other for dominance.
34Tue, December 23rd ,2008 7th day follicular 22 days to your next cycle. • Under the influence of several hormones, all but one of these follicles will undergo atresia, while one (or occasionally two) dominant follicles will continue to maturity.
35Wed, December 24th ,2008 8th day follicular 21 days to your next cycle. • Your fertility increases throughout the follicular phase
36Thu, December 25th ,2008 9th day follicular 20 days to your next cycle. • As they mature, the follicles secrete increasing amounts of estradiol, an estrogen. The estrogens that follicles secrete initiate the formation of a new layer of endometrium in the uterus. The estrogen also stimulates crypts in the cervix to produce fertile cervical mucus
• Research supports the suggestion that a bright 100W bedside lamp used on 5 consecutive nights prior to ovulation can cause reduction of long menstrual cycles.
37Fri, December 26th ,2008 10th day follicular 19 days to your next cycle. • The time needed for recruitment of the follicles and selecting the best (dominant) follicle for the ovulation causes variations in the length of the cycle.
• Normal sperm life inside a woman ranges from 1-5 days, though a pregnancy resulting from sperm life of 8 days has been documented. If you are trying for a baby, it would be a good time to try today and in the next 5 days. Because ovulation dates are different for every woman and each cycle, it is suggested that if a woman wants to conceive, the most fertile time occurs between today and the next 9 days to come.
38Sat, December 27th ,2008 11th day follicular 18 days to your next cycle. • This day (as well as the the next 3 days) is a good day to try for a baby.
39Sun, December 28th ,2008 12th day follicular 17 days to your next cycle. • When the egg has matured, it secretes enough estradiol to trigger the acute release of luteinizing hormone (LH).
40Mon, December 29th ,2008 13th day follicular 16 days to your next cycle. • In the average cycle this LH surge starts around cycle day 12 and may last 48 hours.
41Tue, December 30th ,2008 14th day ovulation 15 days to your next cycle. • Ovulation: The release of the ovum. The egg is swept into the fallopian tube. If fertilization occurs, it will happen in the fallopian tube, today or tomorrow. (A released egg can be fertilised for up to 48 hours)
42Wed, December 31st ,2008 15th day luteal 14 days to your next cycle. • After ovulation, the follicle which held the egg transforms into the corpus luteum. It will produce progesterone for approximately the next 2 weeks. Progesterone helps forming a lining receptive for implantation and supportive of the early pregnancy.
43Thu, January 1st ,2009 16th day luteal 13 days to your next cycle. • 24-30 hours after fertilization the first cell division (mitosis) takes place.
• Progesterone raises the body temperature to provide a fertile environment for the ovum by 0.25 °C to 0.5 °C (0.5 °F to 1.0 °F), thus women who record their basal body temperature on a daily basis will notice that they have entered the luteal phase.
44Fri, January 2nd ,2009 17th day luteal 12 days to your next cycle. • If fertilization of an egg has occurred, the egg and sperm united are called a zygote. It will travel through the fallopian tube, making its way to the uterus.
45Sat, January 3rd ,2009 18th day luteal 11 days to your next cycle. • If an egg is not fertilised within 24-48 hours of ovulation, the rest of the luteal phase is considered to be relatively infertile.
46Sun, January 4th ,2009 19th day luteal 10 days to your next cycle. The zygote's rapid cell division from 2 to 4 to 8 now reached 16 cells. By this day the ball of cells is called a morula.
47Mon, January 5th ,2009 20th day luteal 9 days to your next cycle.
48Tue, January 6th ,2009 21th day luteal 8 days to your next cycle. The morula's rapid cell division from 16 to 32 to 64 now reached 128 cells. A cavity is formed within the ball of cells. It is now called a blastocyst or blastula. Very soon the blastocyst will have so many cells that individual cells are no longer recognizable
49Wed, January 7th ,2009 22th day luteal 7 days to your next cycle. • A fertilized blastocyst will implant itself into the uterine. The point of implantation becomes the origin for the placenta and umbilical cord. Note that impantation can occur several today, but also several days from now...
50Thu, January 8th ,2009 23th day luteal 6 days to your next cycle. • Shortly after implantation, the growing embryo will signal its existence to the maternal system. One very early signal consists of human chorionic gonadotropin (hCG), a hormone that pregnancy tests can measure
51Fri, January 9th ,2009 24th day luteal 5 days to your next cycle. • The level of hCG is increasing, but still too low to measure with a home pregnancy test. The level will double every 2 or 3 days.
52Sat, January 10th ,2009 25th day luteal 4 days to your next cycle. • a hCG blood test may now see an increased hCG level. It is still too early for a home pregnancy test measuring the hCG in the urine test.
53Sun, January 11th ,2009 26th day luteal 3 days to your next cycle.
54Mon, January 12th ,2009 27th day luteal 2 days to your next cycle. • There is a good chance that a home pregnancy test can pick up enough hCG to confirm a pregnancy. A negative test doesn't mean you're not pregnant, there may simply not be enough hCG yet because it is to early after implantation.
55Tue, January 13th ,2009 28th day luteal 1 days to your next cycle. • if the egg is not fertilised and does not implant, the corpus luteum will disintegrate after approximately two weeks, causing the drop in progesterone levels that signals the start of menstruation and the beginning of a new cycle
A new cycle starts here!
Days from now Date Day of cycle Phase Days to your next cycle What's happening?
56Wed, January 14th ,2009 1st day menstrual 28 days to your next cycle. • The menstrual phase usually lasts 3 to 5 days, but anywhere from 2 to 7 days is considered normal


Things to know

  1. A woman's total egg supply is formed in fetal life, to be ovulated decades later.
  2. The fertile period starts at the menarche (first menstrual period) and ends with the menopause.
  3. Over her reproductive lifetime a woman will ovulate approximately 400 to 450 times.
  4. Unlike almost all other species, humans are the only mammal to lack obvious, visible manifestations of ovulation

Cycle in general

  1. Cycle length can also vary from month to month, with up to 8 days variation between cycles still considered as a regular menstrual cycle.
  2. The medical term for cycles with intervals of 21 days or fewer is polymenorrhea
  3. The medical term for cycles with intervals exceeding 35 days is oligomenorrhea. Long cycles are usually associated with ovulation problems:
    - there may be no ovulation (anovulation),
    - ovulation may bevery irregular,
    - ovulation is abnormal (inadequate egg quality).
  4. The medical term for cycles with intervals exceeding 180 days is amenorrhea. Women with very low body fat, such as athletes, may cease to menstruate. Amenorrhea also occurs during pregnancy.
  5. Stressors as subtle as night work or shift work can lead to irregular menstrual cycles. Keep stress levels down.
  6. Your cycle may fluctuate for a variety of reasons, including illness, travel, stress, exercise level, and significant weight loss or gain. Adolescents, women who are breastfeeding, and those who have recently stopped taking birth control pills also commonly experience fluctuations in their menstrual cycles.

Follicular phase

  1. The length of the follicular phase (aka proliferative phase) — and consequently the length of the menstrual cycle — may vary widely.
  2. Age dependant: 14.2 days in women aged 18-24 years, 10.4 days in women aged 40-44 years.
  3. Diet: Eating a low fat diet may lengthen this phase by as much as 2 days
  4. If you were using oral contraceptives for a longer period, or in the last 90 days this phase may be longer.
  5. women with a history of miscarriages may have a shorter phase (-2 days)
  6. (occasional) marijuana use may result in a longer phase ((+2) 3,5 days)
  7. If you ovulate very late in a cycle, (more than 21 days into your cycle) and have problems getting pregnant or maintaining a pregnancy visit your doctor. Treatment may help you achieve a more succesful cycle.

(Pre-)Ovulation

  1. Pre ovulation pain, detection of perovular cervical mucus, and the change in physical character and position of the cervix are reliable signs of preovulation
    - Pre-ovulation pain, or mittelschmerz can appear suddenly and usually subsides within hours. In some women, the mittelschmerz is localized enough so that they can tell which of their two ovaries provided the egg in a given month.
    - During, and several days before ovulation the cervix may feel softer and wetter and its position we be higher than before and after ovulation
    - During, and several days before ovulation the volume of your cervical fluid may increase. It will also be clearer, and you will be able to stretch it furter between your forefinger and thumb than before and after ovulation
  2. A woman's vulva may swell just prior to ovulation, especially the side on which ovulation will occur
  3. Some woman may spot a little blood during ovulation. This is normal and occurs when the egg ovulates. This spotting is more common in longer cycles.

Lutheal phase

  1. The average luteal phase length is 14 days. (ranging from 10-16 days)
  2. It is also called DPO. (Days Past Ovulation)
  3. A short luteal phase lasts less than 11 days may be associated with a luteal phase defect. (LPD) If you conceive and you have a luteal phase defect, you will have an early miscarriage. Luteal phase defect can be easily corrected, for example with vitamin B6, progesterone cream and/or Clomid (increases progesterone through enhancing follicular development), depending on the cause.
  4. The length of your luteal phase can be measured through hormone-specific blood tests or by charting your basal body temperature.

If you're seriously overweight, speak to your doctor about starting a gradual weight-loss program. Obesity may affect hormonal signals to the ovaries and interfere with ovulation. In addition, increased weight can cause insulin levels to climb, causing the ovaries to overproduce male hormones and stop releasing eggs.