The emergency contraceptive pill may lead to ectopic pregnancy, but the probability of this happening is relatively low. Therefore, if the patient does not have the requirement to have children, he/she should try to use conventional contraceptive methods such as IUD or condom for contraception, and emergency contraceptive pills are not recommended as a conventional contraceptive method. This is because the emergency contraceptive pill is a high dose of highly effective progestin, which has the effect of inhibiting the peristalsis of the fallopian tubes, which can easily cause ectopic pregnancy if a fertilized egg has already formed. In addition, the emergency contraceptive pill needs to be taken by the patient within 72 hours of unprotected sex, and the earlier it is taken, the higher the success rate of contraception.