Generally speaking, for women with regular menstrual cycle, within one week of clean menstruation or within one week of the upcoming menstruation, it is a physiological safe period, and having intercourse during this period can relatively reduce the chance of pregnancy. However, the safe period is not absolutely safe, and some women may have additional ovulation. If you have extra ovulation during the safe period, you can also get pregnant during intercourse, and you cannot rely on the safe period for contraception. If you don’t want to have children, you should take intrauterine device or oral short-acting contraceptive pills or tools such as condoms for effective contraception to avoid the failure of using safe period contraception and abortion to cause more harm to women’s bodies.