Emergency contraceptive pills will be less harmful compared to medical abortion, and taking emergency contraceptive pills once in a while will affect menstruation slightly more. After taking emergency contraceptive pills, patients may experience withdrawal bleeding, irregular vaginal bleeding or affect ovulation, delaying ovulation and leading to delayed menstruation or short-term amenorrhea. If an unplanned pregnancy occurs and the gestational sac is found to be small, a medication abortion is performed, and the damage in this case is not certain. If the medication abortion is completely successful, the effect on the woman is usually not too great. If the medical abortion is unsuccessful, a purging procedure is performed. The purging procedure is more damaging than an abortion, and may damage the basal layer of the uterus and cause scarring, which may affect the amount of menstruation in the future or affect future pregnancies, and so on. Emergency contraceptive pills will cause less damage compared to medical abortion, which is uncertain. If the abortion is completely clean, the damage will be small, but if the abortion is not clean, the damage of purging the uterus will be relatively large.