Taking birth control pills menstruation 14 days earlier, consider may be ovulation bleeding. Because 14 days before menstruation is exactly the period of ovulation, the level of estrogen in the body decreases during ovulation, the lining loses the nutrition of estrogen, and a small amount of shedding and bleeding will occur. Usually the bleeding is relatively small and the time will be relatively short. In this case, you can continue to take drugs, soon after the follicle discharges the egg to form the corpus luteum, which can secrete progesterone and promote the growth of the uterine lining can stop bleeding. If the bleeding is heavy, similar to normal menstruation, you should stop using drugs. If necessary, under the guidance of a doctor to stop bleeding medication, bleeding should not be related to the use of contraceptives.