Is 4 days before menstruation safe period

4 days before menstruation is the safe period. The

safe period refers to the period when women are not easy to conceive. From the point of view of ovulation time, ovulation generally occurs about 14 days before the next menstrual cycle. If the menstrual cycle is regular, then ovulation has passed for a period of time before menstruation, at which time the possibility of egg survival is relatively low.

However, the survival time of sperm in the female reproductive tract is also a factor to be considered. Although sperm can survive for a certain period of time, but in the first four days of menstruation, after a long time, sperm motility may decrease, and the chance of combining with eggs may also decrease accordingly.

However, it should be noted that the safe period is not absolutely safe. Because women's menstrual cycle may be affected by many factors, such as mood fluctuations, environmental changes, diseases, drugs, etc., this may lead to fluctuations in ovulation time, thus making the calculation of safe period inaccurate.