Taking contraceptives during the safe period generally does not have much effect, but there are great individual differences, and there may be adverse reactions to contraceptives such as: nausea, vomiting and other gastrointestinal reactions, irregular vaginal bleeding and menstrual disorders and so on. Most of them do not require special treatment and can be relieved on their own, but if there are serious adverse reactions, it is necessary to consult a doctor in time. Common contraceptives include long-acting, short-acting and emergency contraceptives. Contraceptives are steroidal hormones, mainly estrogen and progesterone. Regular use of birth control pills has a very high contraceptive rate, but irregular use may lead to contraceptive failure.