After taking the emergency contraceptive pill for five days and then have intercourse, such as ovulation need to take the emergency contraceptive pill again. The emergency contraceptive pill is a morning-after pill, mainly by interfering with the fertilization of the egg, inhibit ovarian ovulation, so as to achieve the purpose of contraception. Emergency contraceptive pills need to be taken within 72 hours after sex, the earlier the time to take contraceptive effect is better, such as taking emergency contraceptive pills after having sex again without measures, the drug can not play a contraceptive role, if the time is ovulation may lead to pregnancy, need to take emergency contraceptive pills again to remedy. Emergency contraceptive pills have a lot of side effects, repeated use of the drug may lead to menstrual disorders, endocrine disorders, it is recommended not to frequent use of emergency contraceptive pills, such as no recent desire to have children, it is recommended to do a good job of contraceptive measures.