Contraceptives are not recommended to be taken continuously due to the fact that they can cause menstrual changes such as delayed menstruation and irregular bleeding. It can also cause gastrointestinal reaction nausea, or breast swelling, dizziness, fatigue, and other reactions similar to early pregnancy. Emergency contraceptive pills belong to the morning-after pill, used as an emergency remedy after unprotected sex, the sooner it is taken within 72 hours, the better the effect. If there is no requirement to prepare for pregnancy, it is recommended to use condoms for contraception, which has fewer side effects and will not cause the above side effects to appear, and avoid taking emergency contraceptive pills for a long time. Other contraceptive measures, such as extracorporeal ejaculation, safe period contraception, etc., are not recommended because they all have a chance of contraceptive failure. Condom contraception is preferred and is safer and more reliable. Regardless of the method of contraception, if there is a delay in menstruation, it is necessary to test the early pregnancy test or check the blood HCG to rule out the possibility of pregnancy.