If it is an emergency contraceptive, it is recommended to take it as soon as possible for better results, not later than 72 hours after intercourse. Contraceptive pill is a kind of progestin, can make the mucous membrane in the cervix to increase secretion, reduce the amount of sperm crossing the cervix, so as to reduce the possibility of fertilization, in order to achieve the effect of contraception. However, contraceptive pills are hormonal drugs with relatively large side effects, which may cause endocrine disorders, menstrual disorders, deterioration of the skin condition, and even lead to infertility in women. Therefore, in order to minimize the side effects when taking contraceptive pills, vitamins, such as vitamin E and vitamin C, can be used in conjunction with the use of vitamins under the guidance of a doctor. If you are not going to have children for the time being, you can use condoms, extracorporeal ejaculation, or intrauterine devices to prevent pregnancy to minimize the harm to the female body.