Absolute safety period refers to 1-7 days and the last 4-5 days of the cycle, which is an absolute safety period. Rest days are relatively safe, because ovulation may be affected by many factors to advance or postpone for a few days, so it is called relative safety.

If you have sex during the absolute safety period, it is almost impossible to get pregnant unless there are very special circumstances, that is, two or more ovulation in a cycle; Moreover, in the period when sexual intercourse is relatively safe, the probability of contraceptive failure is greater.

Extended data:

Normal women of childbearing age have menstrual cramps once a month. The period from this month to the first day of the next menstrual period is called a menstrual cycle. Ovulation day is usually about 14 days before the next menstrual cramp. The discharged eggs can survive for about 24 hours. If fertilization cannot be completed, they will degenerate and be absorbed by the human body.

Sperm can maintain fertilization ability 1 ~ 3 days after entering female reproductive tract. Therefore, it is possible for men and women to get pregnant only from 3 days before ovulation to 1 day after ovulation. If sperm and egg meet, either party has lost the ability to fertilize and cannot conceive.

People's Daily Online-Women's Health Care: What are the absolute safety periods for women? (photo)