Three days after the end of a woman’s menstrual period does not belong to the absolute safe period, because women usually do not have an absolute safe period. If a woman has a regular menstrual cycle of 28-35 days, ovulation occurs in the middle of the two menstrual periods, that is, the next menstrual period is pushed forward about 14 days, a few days before and after ovulation is a relatively dangerous period, and 3 days after menstruation is relatively safe, but not absolutely safe. Women’s ovulation can be affected by many factors, such as environmental factors, dietary factors and emotional factors, so ovulation may be advanced or pushed back, and some women have irregular menstrual periods, ovulation is not regular, so in the end of the menstrual period 3 days may also be ovulation, if coitus is not a good contraceptive measures, there is a possibility of pregnancy. If women do not intend to get pregnant, they must take contraceptive measures to avoid unwanted pregnancy; if there is a delay in menstruation, such as delayed for more than a week, it is recommended to actively go to the regular hospital to clarify the cause, and then targeted treatment.