Yutin contraceptive pill to eat a pill will not play a contraceptive effect, it is best to take two, generally recommended to take in accordance with the instructions, but also in the doctor’s guidance to take reasonable, so that it is safer, so as not to take the drug improperly, can not play a contraceptive effect. Emergency contraceptive pills are generally taken within 72 hours after the incident has a certain effect, if you take the time is not right, will also be contraceptive failure. Emergency contraceptive pills have a lot of side effects, it is best not to take it often, not more than 3 times a year at most. Usually it is best to do a good job of contraception, it is recommended that the use of condoms, you can also use contraceptive pills, but also in the safe period of coitus, which can avoid pregnancy, usually pay attention to vulvar hygiene, so as not to cause gynecological infections and so on.