If you have intercourse once without contraception, and you are ovulating at that time, there is a possibility of conception. Therefore, if you are not planning to get pregnant, you should always take effective contraceptive measures during intercourse, such as condoms, short-acting pills, and intrauterine devices. If you have intercourse without safety measures, you can use the emergency contraceptive pill within 72 hours of intercourse, which can effectively play the role of contraception, in order to avoid early pregnancy and then find a way to terminate the pregnancy. Whether it is abortion or medical abortion, the damage to the body is objective, so try to avoid it when you can. The emergency contraceptive pill as an aftercare pill should not be used repeatedly as a regular contraceptive method because it contains a large amount of progestin, which can have adverse effects on ovarian function and may cause side effects such as nausea, vomiting and irregular vaginal bleeding.