The phenomenon of bleeding 5 days after taking the pill is mainly due to the fact that the pill is a highly effective progestin, which will thicken the endometrium after taking it, and the endometrium will lose the support of exogenous progestin after stopping the pill, so there will be withdrawal bleeding. The reason is that the ovaries have already formed the corpus luteum and the endometrium will not shed under the support of the corpus luteum, so there will be no withdrawal bleeding after stopping the pill. Whether there is bleeding after taking the pill or not, it does not indicate success or failure of contraception. In addition, if bleeding occurs after taking the pill, it is recommended to keep the vulva clean and most of the clinics do not need to deal with it, and the bleeding will be cleared in about 3 days.