A few days after the menstrual period is the safe period.

The safe period after menstruation usually refers to the few days following the end of a woman's menstrual period, during which sexual intercourse is theoretically less likely to result in pregnancy. However, the exact number of days in the safe period is not fixed, as it is influenced by various factors such as the length and regularity of the menstrual cycle, and individual differences. Typically, a woman's menstrual cycle lasts between 21 to 35 days, with ovulation generally occurring about 14 days before the next menstrual period. Therefore, if a woman has a 28-day cycle, ovulation would occur around day 14, and the safe period might be the first few days after menstruation ends and the days following ovulation. However, this method of calculation is not very reliable because a woman's menstrual cycle can vary due to numerous factors, and sperm can survive in the female body for up to five days, meaning pregnancy could occur even a few days before ovulation.

Thus, if a woman wishes to avoid pregnancy, relying solely on the safe period is not sufficiently reliable. The safest and most effective approach remains the use of appropriate contraceptive methods. At the same time, it is important to understand one's own body and pay attention to changes in the menstrual cycle.