Birth control pills are mainly long-acting contraceptives as well as short-acting and emergency contraceptives. Contraceptive pills are mainly estrogen and progesterone, which block the sperm from meeting the egg or interfere with the fertilization of the egg to achieve the effect of contraception. Long-term use of contraceptive drugs may cause disruption of the endocrine system and lead to menstrual disorders, amenorrhea and infertility, so it is recommended to use condoms or the IUD to avoid adverse reactions. Contraception can also choose the safe period to carry out, but the rate of complete contraception is relatively low, the safe period is mainly within a week after the onset of menstruation, can also take the way of in vitro ejaculation to carry out, the contraceptive rate is also very low, most cases do not take, in order to prevent the failure of contraception.