Aunt is also known as menstruation, drinking birth control pills how long to delay menstruation there is no specific answer, each woman’s physical condition is different, some may advance; some may be delayed for a week; some may fail to contraceptive pregnancy, pregnancy, after the entire pregnancy no longer come to menstruation. There are more types of contraceptives, including emergency contraceptive pills, short-acting contraceptives, long-acting contraceptives, and different drugs have different effects on a woman’s body after taking them. For example, emergency contraceptive pills contain large doses of progesterone, women are taken half a cycle before menstruation, there may be retreating bleeding for 3 to 7 days after taking the pill, and a woman’s menstruation will not necessarily be delayed. Some women after taking birth control pills will disorganize the body’s hormone levels, there is a delay in the performance of menstruation does not come, menstruation may be delayed for a week or even longer time. In addition, delayed menstruation should also be considered as pregnancy after contraceptive failure, which can be manifested by menopause throughout the pregnancy. Drinking birth control pills such as menstrual abnormalities, it is recommended to go to the hospital in a timely manner to check, and follow the doctor’s instructions to deal with treatment.