If you don’t want to have children, you should take contraceptive measures in advance, you can use birth control ring or condom, which is the more common method. If you don’t take contraceptive measures, you can take emergency contraceptive pill within 72 hours after intercourse to achieve the effect of contraception, this contraceptive method should not be commonly used, not more than 3 times in a year, otherwise it will lead to hormonal imbalance in the body, irregular vaginal bleeding and other phenomena. If you do not take contraceptive measures after intercourse and you are pregnant, you should have an ultrasound to check the size of the pregnancy sac in time, and you can have a medical abortion within 49 days of pregnancy, or an abortion within 3 months if it is more than 49 days.