Yuting as a kind of emergency contraceptive pill, need to be taken immediately after unprotected sex, the sooner you take the better effect, can be taken within 72 hours after sex, 1 tablet to eat after 12 hours to take another tablet, before and after taking the pill 1 hour is best not to eat something. Yutin’s contraceptive efficiency can not reach 100%, so, after taking emergency contraceptive pills to observe their menstrual situation, if the time to menstruation does not come, the first thing to rule out is not pregnant. Because the emergency contraceptive pill contains a large dose of progesterone, so some people take it may lead to early or delayed menstruation, if delayed, first of all, to rule out the possibility of pregnancy; secondly, to consider the problem of the drug. This contraceptive pill cannot be used as a regular method of contraception and should not be taken more than twice in a month or more than three times in a year.