1.Emergency contraceptive pill can only have the effect of post-event contraception on the previous sex, after taking the pill, you cannot have unprotected sexual intercourse again. 2, a small amount of vaginal bleeding after taking the pill is not a sign of successful contraception, if there is no menstrual bleeding, you should go to the hospital for examination as soon as possible. 3, vomiting occurs within 1 hour after taking the pill, should be taken as soon as possible to replenish 1 time. 4, emergency contraceptive pill can only be used occasionally, can not replace the conventional contraceptive methods. 5, has been pregnant women prohibited emergency contraceptive pills, because emergency contraceptive pills on the established pregnancy is no abortion effect. 6, after unprotected sex, the earlier the pill is taken, the better the effect of preventing unwanted pregnancy.