The duration of bleeding after taking the pill is 3-7 days and does not last too long. Birth control pills are hormonal drugs that cause abnormal endocrine hormones in the body, which may lead to abnormal bleeding. However, there are some people who will not have any effect after taking the pill, and it will not cause early menstruation or delayed menstruation, or even bleeding, which is normal. Bleeding after taking emergency contraceptive pills is not a sign of successful contraception, but only an adverse reaction to the drug. It is recommended to pay attention to personal hygiene, avoid cold and stimulating food, do not drink, stay up late, pay attention to more rest and observe for a few days. However, if the bleeding is too long and the amount of bleeding is too much, it is also necessary to go to the hospital for appropriate examination to prevent other diseases.