The harm of the emergency contraceptive pill lasts for about 1 month at most. The emergency contraceptive pill, as an aftercare pill, has some contraceptive effect when taken within 72 hours after sex without contraception. However, the hormone content of the emergency contraceptive pill is particularly large. 1 pill of the emergency contraceptive pill is equivalent to the level of progestin in 7 pills of the short-acting contraceptive pill, so it can cause side effects after taking the pill, mainly withdrawal bleeding and menstrual disorders. If the vaginal bleeding is small after stopping the pill, there is no need to deal with it, and if the bleeding is large, it will be treated as a menstrual flow. In general, you can only take the emergency contraceptive pill once a month and not more than 3 times a year. The emergency contraceptive pill has some harmful effects, but the effect of the emergency contraceptive pill will disappear in less than 1 month.