Bleeding 7 days after taking emergency contraceptive pills is usually associated with menstruation. The emergency contraceptive pill itself is actually a progestin, after taking emergency contraceptive pills, there will usually be a withdrawal bleeding once a week or so. Mainly through the inhibition of the body’s estrogen secretion and ovulation, as a way to prevent the combination of egg and sperm, so that the embryo does not grow causing hidden spontaneous abortion. Due to the different physique of each woman, there are some differences in the duration of menstruation after taking emergency contraceptive pills. Taking emergency contraceptive pills tends to cause irregular menstruation, menstruation may be early or late, it is more difficult to determine the time of the next arrival, so the time of menstruation can not be generalized. Emergency contraceptive pills belong to a kind of hormonal drugs, regular use is very harmful to the body, easy to lead to endocrine disorders, causing menstrual disorders. If it is simply used for contraception, long-term use is not recommended.