At present, the commonly used contraceptives are short-acting oral contraceptives and emergency contraceptives, short-acting oral contraceptives, if there is no leakage, the success rate of contraception can reach 99%, this contraceptive pill is very effective. If you take the emergency contraceptive pill, the success rate of contraception can reach 90%, there are still 10% of the people who take emergency contraceptive pill does not work, emergency contraceptive pill is suitable for less than 72 hours, there is no protective contraceptive measures to take a contraceptive method, the earlier you eat, the better the effect. The sooner you take it, the more effective it will be. If you take it more than 72 hours later, it won’t work. If you do not want to have children, it is best to use short-acting oral contraceptives.