If you are taking a long-acting pill or a short-acting pill, having sex after taking the pill will not usually result in pregnancy and will not cause serious adverse reactions. If you are taking emergency contraceptives and have intercourse after taking the pill, there is a risk of pregnancy and you should take the pill again. However, long-term use of the pill may cause adverse reactions, mainly early pregnancy-like reactions as well as irregular vaginal bleeding, menstrual disorders, amenorrhea, weight gain, and some women may experience hyperpigmentation, but contraceptive failure may occur if regular use of the drug is not performed. Most of the adverse reactions can be relieved by themselves without special treatment, but if there is heavy vaginal bleeding or other serious adverse reactions, it is necessary to stop using the drug or change to other contraceptive drugs in time.