How To Determine Your Ovulation Cycle

When attempting to get pregnant, knowing when ovulation happens and when a person is most fertile might be beneficial. Certain individuals may prefer to monitor their reproductive window in order to avoid conception.

Females are most fertile within a day or two of ovulation, or the release of an egg by the ovaries. However, pregnancy is feasible during the days preceding ovulation, as sperm can survive for several days inside the female body.

The days of the menstrual cycle during which a woman is least likely to become pregnant are occasionally referred to as the safe period.

The purpose of this article is to explain how to determine the fertile window in order to facilitate or avoid conception.


  • Fertility is determined by the time of ovulation.
  • The menstrual cycle of the average person lasts between 28 and 32 days. Certain individuals have shorter cycles, while others have significantly longer ones.
  • The first day of a woman’s menstrual cycle is considered the first day of her period. Their menstrual then normally lasts between three to seven days.
  • Variations in the menstrual cycle typically occur during the follicular phase preceding ovulation.
  • The luteal phase, which lasts approximately 14 days from ovulation to the start of the following period, is normally 14 days long.

Ovulation And Fertilization

Ovulation is the process through which an egg is released from one of the ovaries. Following release, the egg travels to the fallopian tube, where it remains for approximately 24 hours.

If sperm goes to the fallopian tube and fertilizes the egg within this time period, pregnancy develops. If no sperm fertilizes the egg, it goes to the uterus and begins to degrade, preparing to exit the body during the next menstrual period.

Fertile Period

Calculating The Ovulation Cycle

According to the American College of Obstetricians and Gynecologists, how to calculate fertile period is to count during the ovulation period that occurs approximately 14 days before a woman’s monthly cycle ends. 

The majority of women ovulate between days 11 to  21 of their menstrual cycle. The first day of their cycle is the first day of their last menstrual period (LMP). Ovulation does not always take place on the same day each month and can occur up to a day or more before or after the scheduled date. You can surely consider a fertile period calculator!

Doctors refer to the period of the cycle surrounding ovulation as the fertile window since it is at this time that a woman’s chances of pregnancy are greatest. If a woman ovulates on day 14, for example, she may conceive that day or within the next 24 hours.

Their viable window, on the other hand, starts a few days before ovulation, as sperm can live for up to five days inside the female body. Thus, even if a woman does not have sex on day 14 or 15, she may still become pregnant if she had unprotected intercourse between day 9 to 13.

Research in the journal of Human Reproduction examined data from 5,830 pregnant women and the researchers discovered that the probability of becoming pregnant increases significantly seven days after the LMP. By 15 days, the probability of pregnancy is greatest and returns to zero at 25 days.

The probability of being within the fertile window for the women in the study was as follows:

  • 2% on day 4 of their cycle
  • 58 percent on their cycle’s 12th day
  • 5% on the 21st day of their cycle

Additionally, the data indicates that older women and women with normal menstrual cycles conceive early in their cycle.

It is critical to remember that these findings should only be used as a guideline. Each individual and each cycle are unique.

It can be beneficial for a woman to monitor her monthly cycle and keep track of the indicators of ovulation in order to pinpoint the precise day of ovulation each month.

Signs Of Ovulation

During ovulation, a person’s basal body temperature may somewhat increase.

Keeping track of the indicators of ovulation can assist someone in determining the exact day on which they ovulate each month.

Among the indicators are the following:

Vaginal Discharge
  • Mild abdominal cramps
  • Vaginal discharge that is wetter, brighter, and more slippery, similar to egg white
  • A little elevation in the body’s basal temperature
  • A stronger sexual urge
Sexual urge

Some of these indicators, such as basal body temperature, will continue to fluctuate following ovulation. As a result, one should avoid using temperature to forecast the fruitful window.

It may be beneficial for someone to document their symptoms for a few months in order to develop an understanding of what is normal for their body.

However, they should keep in mind that various circumstances affect ovulation, and the date of ovulation might vary from month to month.

Additionally, you can utilize an ovulation predictor kit or a fertility monitor.

Each month, fertility aids determine the ovulation day by measuring the amounts of particular hormones in the urine. Additionally, some sensors identify days of maximum fertility.

Combining these strategies may provide the highest level of accuracy for an individual.

The following table outlines a typical menstrual cycle and the likelihood that an individual will be fertile at each stage:

Cycle Day Fertility Stage

  • Menstruation stage day 1–7: The least productive stage
  • Post-menstrual period day 8- 9:  Possibility of conception
  • Prior to ovulation day 10–14: The most fertile period
  • Post-ovulatory day 15–16: Possibility of conception
  • Uterine lining thickening day 17-28:  Less fertile — less likely to conceive

Optimizing Fertility And Conception Chances

To increase one’s chances of becoming pregnant, sexual activity should be scheduled within the two to three days preceding and including ovulation. Sex on any of these days may result in a 20%–30% risk of pregnancy.

Additional strategies to increase your chances of conception include the following:

Smoking Woman
  • Have sexual relations on a regular basis. Pregnancy rates are highest in couples who have intercourse every two or three days during the month.
  • Abstain from smoking. Tobacco usage decreases fertility and has a negative effect on the health of an unborn child.
  • Consume alcohol in moderation. Alcohol consumption has been shown to decrease fertility in both males and females, as well as impair a developing fetus.
  • Maintain a healthy body weight. Overweight or underweight women are more likely to experience irregular ovulation.
  • A doctor can evaluate a couple’s overall health and may be able to recommend ways to increase the couple’s chances of conception.
  • Keeping pregnancy at bay
  • Individuals seeking the fertility awareness method should consult a physician.
Drunk Woman Alcohol

Certain women may prefer to monitor their fertility in order to avoid pregnancy. This is referred to as the fertility awareness technique.

According to the Centers for Disease Control and Prevention (CDC)Trusted Source, methods of contraception based on fertility awareness have a 24 percent failure risk with normal use.

Pregnancy odds are lowest during a person’s menstruation and in the days preceding and fertile days after period.

They may, however, become pregnant if they ovulated early or late in their cycle, as sperm can survive for several days in the body.

Individuals interested in using the fertility awareness method should consult their physician first.

Fertility And Age

Ovulation period for pregnant and the fertile window vary every cycle, but they may also vary with age. Female fertility naturally tends to drop beyond the age of 35.

With age, the amount of eggs and the quality of the eggs drop. Additionally, ovulation may become erratic.

Certain medical disorders, such as endometriosis or polycystic ovarian syndrome, further complicate conception.