What are the days of the physiological safe period?

Generally speaking, the physiological safe period refers to the time frame within a woman's menstrual cycle when pregnancy is less likely. It usually includes two phases: the pre-ovulatory physiological safe period, which spans from the day menstruation ends to the day before ovulation begins, and the post-ovulatory physiological safe period, which starts the day after ovulation ends and lasts until one day before the next menstruation begins. However, the exact duration of these safe periods may vary due to differences in individual menstrual cycles. The details are as follows:

For women with regular menstrual cycles, if the cycle is 28 days long, ovulation typically occurs 14 days before the next menstrual period begins. The ovulation period includes the ovulation day itself, plus the five days before and the four days after. The time from the end of menstruation to the day before the ovulation period begins is considered the pre-ovulatory physiological safe period, while the time from the first day after the ovulation period ends to one day before the next menstrual period begins is considered the post-ovulatory physiological safe period. Based on this calculation, approximately 15 days of the menstrual cycle—specifically days 1 to 10, days 19 to 28, or seven days before and eight days after menstruation—are considered the physiological safe period.

For women with irregular menstrual cycles, calculating the safe period must be based on the specific duration of each cycle, measured from the first day of one menstrual period to the first day of the next. However, due to cycle irregularities, ovulation may occur earlier or later than expected, making the physiological safe period relatively unpredictable.

It is recommended to develop healthy lifestyle habits, maintain a balance between work and rest, and avoid excessive fatigue, all of which are beneficial to overall health.