The fifth day of a woman’s menstrual period belongs to the physiological safe period, during which a woman usually does not have mature follicles to be discharged, and intercourse during this period can reduce the chances of pregnancy. For women with irregular menstrual cycles, there may also be additional ovulation on the fifth day of the end of menstruation. Regardless of which period a woman is in, if she has no requirement for childbearing, she should take effective contraceptive measures to avoid unwanted pregnancies that may cause harm to her body. Women can take effective methods of contraception such as intrauterine placement of birth control rings, oral short-acting contraceptive pills, or male condoms.