Your most fertile days
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
| 1 | 2 | 3 | 4 | |||
| 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 19 | 20 | 21 | 22 | 23 | 24 | 25 |
| 26 | 27 | 28 | ||||
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
| 1 | 2 | 3 | 4 | |||
| 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 19 | 20 | 21 | 22 | 23 | 24 | 25 |
| 26 | 27 | 28 | 29 | 30 | 31 | |
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
| 1 | ||||||
| 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| 16 | 17 | 18 | 19 | 20 | 21 | 22 |
| 23 | 24 | 25 | 26 | 27 | 28 | 29 |
| 30 | ||||||
Calculate my cycle
Your ovulation, day by day
A new cycle starts here!
day 1, menstrual phase.
28 days to your next cycle.
• Although the menstrual cycle lasts typically 3 to 5 days, anything between 2 to 7 days is considered normal.
day 2, menstrual phase.
27 days to your next cycle.
• The average bloodloss during menstruation is 35 milliliters (1.2 fl.oz) and anything between 10 and 80 ml (0.33 - 2.7 fl.oz) is considered normal.
day 3, menstrual phase.
26 days to your next cycle.
• Because of the bloodloss during the monthly menstrual cycle, women require more iron then men.
day 4, menstrual phase.
25 days to your next cycle.
• Many women experience uterine cramps during menstruation.
Sat, March 11, 2023
day 5, menstrual phase.
24 days to your next cycle.
day 5, menstrual phase.
24 days to your next cycle.
Sun, March 12, 2023
day 6, menstrual phase.
23 days to your next cycle.
day 6, menstrual phase.
23 days to your next cycle.
day 7, follicular phase.
22 days to your next cycle.
• The lining of the uterine wall is now at its thinnest. The levels of progesterone and estrogen are now at their lowest.
As a result of the increase in Follicle Stimulating Hormone (FSH), five to seven tertiary follicles will be utilised. One of these will become the egg cell.
day 8, follicular phase.
21 days to your next cycle.
• The selected follicles have been developing for almost a year in a process known as folliculogenesis. The follicles vie for dominance.
day 9, follicular phase.
20 days to your next cycle.
• Due to the influence of several hormones most follicles will die in a process known as atresia. One or two will remain and become mature follicles.
day 10, follicular phase.
19 days to your next cycle.
• Fertility increases as the follicular phase progresses.
• Research has indicated a long menstrual cycle can be shortened by placing a clear 100w lamp beside the bed five nights before ovulation.
day 11, follicular phase.
18 days to your next cycle.
• As the remaining follicles mature they produce more estrogen. The estrogen ensures that a new edometrial layer is formed in the womb and that cervical glands produce fertile mucus.
• Sperm lives on average 1 to 5 days but can survive up to 8 days. If you are trying to conceive the best time to try is between now and the next 5 days. Bcause ovulation varies among women it is suggested between now and the following 9 days is the optimum time to try to conceive.
day 12, follicular phase.
17 days to your next cycle.
• The time required to recruit and select the most dominant follicles can result in variations in the length of menstrual cycles.
• Today and for the next three days is the best time to try to conceive.
day 13, follicular phase.
16 days to your next cycle.
• If the egg matures it will produce enough estradiol to begin the process of secretion of (LH) luteinizing hormone.
Mon, March 20, 2023
day 14, follicular phase.
15 days to your next cycle.
• During an average cycle the release of LH begins around day 12 and lasts approximately 48 hours.
day 14, follicular phase.
15 days to your next cycle.
• During an average cycle the release of LH begins around day 12 and lasts approximately 48 hours.
day 15, ovulation phase.
14 days to your next cycle.
• Ovulation: The ovaries release the egg which travels into the fallopian tube. IF fertilisation takes plae it will occure today or tomorrow in this fallopian tube. An egg can be fertilised up to 48 hours after release.
day 16, luteal phase.
13 days to your next cycle.
• After ovulation the ovarian follicle which released the egg changes and is known as the corpus luteum or yellow body. Over the next 14 days this will produce progesterone. Progesterone helps prepare the uterus for implantation and maintains the lining which provides food to the newly implanted egg.
day 17, luteal phase.
12 days to your next cycle.
• Approximately 24 to 30 hours after fertilisation the first mitosis or cell division takes place.
Increased progesterone raises the body temperature in order to provide the optimum conditions for the egg. Body temperature is increased by 0.25 to 0.50 of a degree. Women who take note of their basal body temperature will notice that the luteal phase has begun.
day 18, luteal phase.
11 days to your next cycle.
• If fertiliation has taken place the egg and spermatozoon are known collectively as the zygote. The zygote will travel through the fallopian tube to the uterus. This journey of 10cm or 4 inches proceeds at a rate of 1.5cm or 0.6 inches.
day 19, luteal phase.
10 days to your next cycle.
• If the released egg is not fertilised within 24 to 48 hours, the rest of the luteal phase will be infertile.
day 20, luteal phase.
9 days to your next cycle.
Once the division of the zygote cells increases to 16, the collection of cells are known as a morula.
Mon, March 27, 2023
day 21, luteal phase.
8 days to your next cycle.
day 21, luteal phase.
8 days to your next cycle.
day 22, luteal phase.
7 days to your next cycle.
The morula also grows quickly dividing continuously from 16 to 32, 32 to 64 and 6 to 128 cells. Within this ball of cells an empty space begins to form. The ball is now called a blastocyst. In a short time the cells multiple so rapidly that individual cells cannot be pinpointed.
day 23, luteal phase.
6 days to your next cycle.
• A fertilised blastocyst attaches itself to the uterine wall. At the point where the cell meets the uterus the umbilical cord and placenta begin to form. This implantation can happen today or within the next few days.
day 24, luteal phase.
5 days to your next cycle.
• Shortly after the implantation of the growing embryo, other changes will take place in the body. One of the first signals is the secretion of pregnancy hormone human Chorionic Gonadotropin (hGC). This is the hormone picked up by pregnancy tests.
Fri, March 31, 2023
day 25, luteal phase.
4 days to your next cycle.
• The quantity of hCG increases but may still be too low to be recognised by the standard over the counter pregnancy test. The amount of hGC doubles every 2 to 3 days.
day 25, luteal phase.
4 days to your next cycle.
• The quantity of hCG increases but may still be too low to be recognised by the standard over the counter pregnancy test. The amount of hGC doubles every 2 to 3 days.
Sat, April 1, 2023
day 26, luteal phase.
3 days to your next cycle.
• An hGC bloodtest will now be able to detect the slight increase in hCG but it is still too early for a urine test to be accurate.
day 26, luteal phase.
3 days to your next cycle.
• An hGC bloodtest will now be able to detect the slight increase in hCG but it is still too early for a urine test to be accurate.
day 27, luteal phase.
2 days to your next cycle.
Mon, April 3, 2023
day 28, luteal phase.
1 days to your next cycle.
• From today a sensitive urine based pregnancy test might be able to detect hGC for a positive result. However, a negative test does not mean there is no pregnancy but can indicate that hGC levels are still not sufficient to be measured.
day 28, luteal phase.
1 days to your next cycle.
• From today a sensitive urine based pregnancy test might be able to detect hGC for a positive result. However, a negative test does not mean there is no pregnancy but can indicate that hGC levels are still not sufficient to be measured.
A new cycle starts here!
day 1, menstrual phase.
28 days to your next cycle.
• Although the menstrual cycle lasts typically 3 to 5 days, anything between 2 to 7 days is considered normal.
day 2, menstrual phase.
27 days to your next cycle.
• The average bloodloss during menstruation is 35 milliliters (1.2 fl.oz) and anything between 10 and 80 ml (0.33 - 2.7 fl.oz) is considered normal.
day 3, menstrual phase.
26 days to your next cycle.
• Because of the bloodloss during the monthly menstrual cycle, women require more iron then men.
day 4, menstrual phase.
25 days to your next cycle.
• Many women experience uterine cramps during menstruation.
Sat, April 8, 2023
day 5, menstrual phase.
24 days to your next cycle.
day 5, menstrual phase.
24 days to your next cycle.
Sun, April 9, 2023
day 6, menstrual phase.
23 days to your next cycle.
day 6, menstrual phase.
23 days to your next cycle.
day 7, follicular phase.
22 days to your next cycle.
• The lining of the uterine wall is now at its thinnest. The levels of progesterone and estrogen are now at their lowest.
As a result of the increase in Follicle Stimulating Hormone (FSH), five to seven tertiary follicles will be utilised. One of these will become the egg cell.
day 8, follicular phase.
21 days to your next cycle.
• The selected follicles have been developing for almost a year in a process known as folliculogenesis. The follicles vie for dominance.
day 9, follicular phase.
20 days to your next cycle.
• Due to the influence of several hormones most follicles will die in a process known as atresia. One or two will remain and become mature follicles.
day 10, follicular phase.
19 days to your next cycle.
• Fertility increases as the follicular phase progresses.
• Research has indicated a long menstrual cycle can be shortened by placing a clear 100w lamp beside the bed five nights before ovulation.
day 11, follicular phase.
18 days to your next cycle.
• As the remaining follicles mature they produce more estrogen. The estrogen ensures that a new edometrial layer is formed in the womb and that cervical glands produce fertile mucus.
• Sperm lives on average 1 to 5 days but can survive up to 8 days. If you are trying to conceive the best time to try is between now and the next 5 days. Bcause ovulation varies among women it is suggested between now and the following 9 days is the optimum time to try to conceive.
day 12, follicular phase.
17 days to your next cycle.
• The time required to recruit and select the most dominant follicles can result in variations in the length of menstrual cycles.
• Today and for the next three days is the best time to try to conceive.
day 13, follicular phase.
16 days to your next cycle.
• If the egg matures it will produce enough estradiol to begin the process of secretion of (LH) luteinizing hormone.
Mon, April 17, 2023
day 14, follicular phase.
15 days to your next cycle.
• During an average cycle the release of LH begins around day 12 and lasts approximately 48 hours.
day 14, follicular phase.
15 days to your next cycle.
• During an average cycle the release of LH begins around day 12 and lasts approximately 48 hours.
day 15, ovulation phase.
14 days to your next cycle.
• Ovulation: The ovaries release the egg which travels into the fallopian tube. IF fertilisation takes plae it will occure today or tomorrow in this fallopian tube. An egg can be fertilised up to 48 hours after release.
day 16, luteal phase.
13 days to your next cycle.
• After ovulation the ovarian follicle which released the egg changes and is known as the corpus luteum or yellow body. Over the next 14 days this will produce progesterone. Progesterone helps prepare the uterus for implantation and maintains the lining which provides food to the newly implanted egg.
day 17, luteal phase.
12 days to your next cycle.
• Approximately 24 to 30 hours after fertilisation the first mitosis or cell division takes place.
Increased progesterone raises the body temperature in order to provide the optimum conditions for the egg. Body temperature is increased by 0.25 to 0.50 of a degree. Women who take note of their basal body temperature will notice that the luteal phase has begun.
day 18, luteal phase.
11 days to your next cycle.
• If fertiliation has taken place the egg and spermatozoon are known collectively as the zygote. The zygote will travel through the fallopian tube to the uterus. This journey of 10cm or 4 inches proceeds at a rate of 1.5cm or 0.6 inches.
day 19, luteal phase.
10 days to your next cycle.
• If the released egg is not fertilised within 24 to 48 hours, the rest of the luteal phase will be infertile.
day 20, luteal phase.
9 days to your next cycle.
Once the division of the zygote cells increases to 16, the collection of cells are known as a morula.
Mon, April 24, 2023
day 21, luteal phase.
8 days to your next cycle.
day 21, luteal phase.
8 days to your next cycle.
day 22, luteal phase.
7 days to your next cycle.
The morula also grows quickly dividing continuously from 16 to 32, 32 to 64 and 6 to 128 cells. Within this ball of cells an empty space begins to form. The ball is now called a blastocyst. In a short time the cells multiple so rapidly that individual cells cannot be pinpointed.
day 23, luteal phase.
6 days to your next cycle.
• A fertilised blastocyst attaches itself to the uterine wall. At the point where the cell meets the uterus the umbilical cord and placenta begin to form. This implantation can happen today or within the next few days.
day 24, luteal phase.
5 days to your next cycle.
• Shortly after the implantation of the growing embryo, other changes will take place in the body. One of the first signals is the secretion of pregnancy hormone human Chorionic Gonadotropin (hGC). This is the hormone picked up by pregnancy tests.
Fri, April 28, 2023
day 25, luteal phase.
4 days to your next cycle.
• The quantity of hCG increases but may still be too low to be recognised by the standard over the counter pregnancy test. The amount of hGC doubles every 2 to 3 days.
day 25, luteal phase.
4 days to your next cycle.
• The quantity of hCG increases but may still be too low to be recognised by the standard over the counter pregnancy test. The amount of hGC doubles every 2 to 3 days.
Sat, April 29, 2023
day 26, luteal phase.
3 days to your next cycle.
• An hGC bloodtest will now be able to detect the slight increase in hCG but it is still too early for a urine test to be accurate.
day 26, luteal phase.
3 days to your next cycle.
• An hGC bloodtest will now be able to detect the slight increase in hCG but it is still too early for a urine test to be accurate.
day 27, luteal phase.
2 days to your next cycle.
Mon, May 1, 2023
day 28, luteal phase.
1 days to your next cycle.
• From today a sensitive urine based pregnancy test might be able to detect hGC for a positive result. However, a negative test does not mean there is no pregnancy but can indicate that hGC levels are still not sufficient to be measured.
day 28, luteal phase.
1 days to your next cycle.
• From today a sensitive urine based pregnancy test might be able to detect hGC for a positive result. However, a negative test does not mean there is no pregnancy but can indicate that hGC levels are still not sufficient to be measured.
A new cycle starts here!
day 1, menstrual phase.
28 days to your next cycle.
• Although the menstrual cycle lasts typically 3 to 5 days, anything between 2 to 7 days is considered normal.
More tools
My due date When is your due date? Enter the date of your last period or ovulation and you'll know. (roughly)
My alternative due date A -according to research- more accurate way to determine your due date.
My fertile days Shows your most fertile days and when you can try a home pregnancy test.
Fetus development This interactive movie shows what pregnancy does to your body!
Calculate your BMI Calculate your BMI. (But not during your pregnancy)