After taking birth control pills, if the menstruation is advanced within one week, and the amount of menstruation is normal and can be cleaned up on time, it is the normal fluctuation of menstrual cycle, and there is no need to carry out any examination and treatment, and generally consider that there is no relationship between birth control pills. If the patient takes birth control pills after menstruation more than a week in advance, we should consider two possibilities: first, withdrawal bleeding. Taking birth control pills for about a week began to appear a small amount of bleeding, 3-5 days to be able to clean, the amount is very small, mostly without abdominal pain and other discomforts, considering the withdrawal of bleeding. It is mainly related to the hormonal fluctuations in the patient’s body caused by high potency progesterone, and generally does not need to be dealt with. Second, consider the emergency contraceptive pills caused by endocrine disruption caused by menstrual disorders. In this case, the patient is usually not a lot of bleeding, bleeding time is relatively long, you can take Yunnan Baiyao, caffeic acid and other drugs to stop bleeding for treatment.