If a woman is taking a short-acting contraceptive pill and there is no bleeding after taking the pill, it is mostly considered to be a physiological manifestation caused by hormones that have not yet withdrawn. It usually takes about 3-7 days after taking the pill to cause vaginal bleeding. If a woman is taking the emergency contraceptive pill and there is no bleeding after taking the pill, there are two possibilities: 1) the contraceptive has failed, resulting in pregnancy, so there is no bleeding; 2) the woman is taking the emergency contraceptive pill after ovulation. Because of ovulation, the body itself has the secretion of progesterone, even if you take the emergency contraceptive pill, there will be no withdrawal bleeding phenomenon after stopping the pill. For the time being, you can not worry, observe whether the normal menstrual flow.