Bleeding a few days after taking the pill, mainly consider the following possibilities: first, withdrawal bleeding, because the pill is a hormone, after taking it, it is easy to cause women’s hormone levels to increase, and after the end of the metabolism of the pill there is a drop in women’s body hormone levels, and this hormone fluctuation can cause vaginal bleeding. Second, consider that it may be normal menstruation, because after taking the pill if it comes to the time when menstruation just comes, you can have menstruation. Thirdly, it may be an abnormal pregnancy, such as ectopic pregnancy or pre-eclampsia, and blood chorionic gonadotropin needs to be checked to determine if conception has occurred. At the same time, the blood chorionic gonadotropin and ultrasound changes can be dynamically observed to determine whether the pregnancy is intrauterine or extrauterine. Fourth, consider that the contraceptive pill may have caused menstrual disorders in women.