It is generally not possible to get pregnant after having intercourse during menstruation and ejaculating inside. Women are not prone to pregnancy after sex because ovulation does not occur in the ovaries during menstruation and the endometrium is thin and in the process of exfoliation, but women need to prohibit sex during menstruation, otherwise it may lead to uterine cavity infection, endometriosis and other conditions, which may also lead to menstrual disorders and gynecological diseases later, thus affecting women’s health. Women should pay attention to proper rest during menstruation, maintain cleanliness and hygiene, and avoid getting cold and flu to facilitate the normal discharge of menstrual blood and help the body recover. Women are not allowed to have sex until three days after the menstrual period is clean. Having intercourse in the middle of the menstrual cycle, i.e., during ovulation, is the only time when pregnancy can occur due to the discharge of eggs and the moderate thickness of the uterine lining.