Calculating the fertile period of women after menstruation

Estimating and calculating the fertile period of women after menstruation is one of the main ways to have offspring. That's why to plan a pregnancy, you need to have period records.

Calculating the fertile period of women after menstruation
Calculating the fertile period of women after menstruation


What is a menstrual or menstrual cycle? The menstrual cycle is the range of days from the first day of menstruation to the first day of subsequent menstruation. The normal menstrual cycle is every 21-35 days. Day 1 (one) in the menstrual cycle is the first day of menstruation to occur.

Understanding the fertile period of women

When is the start of menstruation? Menstruation begins on the first day when the uterine wall is decay and comes out with the blood from the vagina. During menstruation, the ovum will develop in the ovaries. When the ovum is ripe, the ovulation will release the egg, this event is called ovulating.

When is ovulation happening? Ovulation generally occurs about 12 – 14 days before the first day of subsequent menstruation. In fact, the day when ovulation occurs depends on your menstrual cycle. If your cycle is short, for example only 22 days, then ovulation can occur only a few days after menstruation ends. So, ovulation time can be different for each woman. To do this, it is important that you know your menstrual cycle in order to estimate ovulation time.

So, when is the fertile period of women? Your fertile period revolves around ovulation time, approximately five days before ovulation occurs. Generally, the fertile period of women is 12 – 16 days before the next period. In other words, the average woman is experiencing the fertile period between the 10th to the 17th day after the first day of the last period. This applies to women who have a 28-day regular menstrual cycle. However, when your cycle is different, you can learn and calculate when your fertile life is.

The challenge is that the length of a woman's menstrual period can change over time, usually lasts 2-7 days. This makes ovulation different a week faster or slower than the previous period.

In addition to the ovulation process, pregnancy is also determined by the sperm process to reach the egg cells. To be pregnant, this ripe egg must be fertilized within 12 to 24 hours.

Calculating your own fertile period

The egg is to be fertilized within 12 – 24 hours after ovulation. Because of this, it is important to detect in the days whether women are in the most fertile conditions. Generally, this fertile period is calculated based on the record and analysis of menstrual cycles for at least the last 8 months.

The approximate fertile period can be calculated by the following formulas:

Know your shortest cycle. Example: 27 days. Subtract this number by 18. The result: 9. This figure is the first day when you are in the most fertile position.
Know your longest cycle. Example: 30 days. Subtract this number by the number 11. The result: 19. This figure is the last day when you are most fertile.
Thus if your average cycle is 27 – 30 days, then you will be the most fertile on the 9th to 19th days.

Women's fertile period indicators after menstruation

To further reinforce the most fertile day prediction, you can use several other indicators, such as:

  • Increased basal temperature
  • The basal temperature is the body temperature when waking up in the morning. Normal temperature is 35,5 – 36.6 degrees C But if your body temperature rises slightly higher than that number, this may mean you are ovulation.
  • Uterine mucus
  • Mucus coming out of the cervix can have dilute consistency until the change in mucus indicates a change in estrogen levels in the body, which is also a sign of whether ovulation immediately occurs. In the fertile period, the slime is clear, slippery, and elastic, such as raw egg whites. This fluid is what will smoothen and protect the sperm path to the uterus to meet the ovum.
  • Mild to severe abdominal pain or one of the back
  • Some women feel this around ovulation time. This pain can also be used as one of the signs to help detect the fertile period.
  • Feeling more passionate
  • Some women feel more passionate, more excited, and more sociable when experiencing a fertile period.


By estimating and calculating the fertile period after menstruation, as well as understanding what happens during the menstrual cycle, you will be more assisted in planning your pregnancy and evaluating reproductive health. If you're still having trouble, you can consult a gynecologist to determine your fertile period.

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