Emergency contraceptive pills after taking, generally there is no special reaction, if the body is more sensitive, there may be nausea, vomiting, dizziness, diarrhea or general weakness, etc., and some women can appear a small amount of vaginal bleeding. With the gradual metabolism of the drug, these symptoms can be gradually relieved, within 10 days of taking the drug vaginal bleeding, bleeding similar to the amount of menstruation, basically can be determined to be successful contraception, if more than the next menstrual period time, there is no vaginal bleeding, then we should consider the possibility of pregnancy, you can use pregnancy test paper test the morning urine to see if it is positive. Emergency contraceptive pills can only be used as a remedy for contraceptive failure after sex, not as a regular form of contraception, some of the drugs on food and time is more strict, in the two hours before and after the drug is not to eat.