Taking emergency contraceptive pills a week of bleeding if the withdrawal bleeding and menstrual flow is normal, if accompanied by other abnormal symptoms, usually abnormal, according to the specific situation analysis. 1. Normal phenomenon (1) withdrawal bleeding: the main component of the emergency contraceptive pill is levonorgestrel, which can delay and stop the release of egg cells to achieve the effect of contraception, this drug is a progestin drug, which will make the uterine lining appear to shed. So some women will have bleeding symptoms in about a week of using emergency contraceptive pills, usually the bleeding is less than the amount of menstruation, and will last about 1~3 days, which is a normal phenomenon. (2) The onset of menstruation: If the emergency contraceptive pill is taken one week before menstruation, and there is bleeding one week later, it may also be the onset of menstruation, which is also a normal phenomenon. 2. Abnormal Uterine fibroids, endocrine disorders, cervicitis, etc. can cause abnormal uterine bleeding or contact bleeding, which is usually accompanied by some other abnormal symptoms, such as increased discharge, odor, lumbago, vulvar itching and so on. Bleeding a week after taking emergency contraceptive pills should be analyzed according to the amount of bleeding as well as other symptoms, and medical consultation is needed when necessary.