Emergency contraceptive pills are not recommended to be taken twice in a row, because emergency contraceptive pills, if it is a two-piece package, usually 12 hours between the second piece of oral, can play a contraceptive effect. If it is a one-piece package, not more than two times a month, not more than three times a year, so as not to take too many emergency contraceptives orally, will cause menstrual cycle disruption, resulting in endocrine hormone imbalance in the body, which may cause endocrine hormone disorders, emergency contraceptives can not be taken twice consecutively orally. Emergency contraceptive pills are not 100% contraceptive, there is a 20% chance of failure, there will be certain side effects, can also cause ectopic pregnancy, as far as possible in the oral about 12 days after the time to buy early pregnancy test, to rule out the chances of conception.