Bleeding a week after taking the pill, mainly consider the following possibilities: First, there is withdrawal bleeding after taking the pill. Because birth control pills are mostly highly effective progestin or estrogen-progestin compound, the hormone level of women will rise rapidly after taking them, and then the hormone level will fall rapidly after the drug metabolism, and this fluctuation of hormone level will cause the endometrium to peel off and bleed; secondly, irregular vaginal bleeding caused by endocrine disorder after taking birth control pills, patients will have more vaginal bleeding or longer bleeding time. The bleeding is not self-limiting and needs to be treated with drugs. Third, consider the patient’s menstrual flow, if the patient takes the pill one week after the time of menstruation, you can observe whether the amount of bleeding is the same as menstruation and whether it will be clean according to the time of menstruation.