How long to take birth control pills without brown blood depends on the specific situation, there are individual differences. If a woman in the early stages of pregnancy due to miscarriage of aura and the treatment of birth control, as long as the embryo is well developed, generally taking birth control drugs for about a week will not flow brown discharge, can be successful birth control. However, if due to the embryo’s own poor development and lead to premature miscarriage, even after taking the birth control drugs can not be successful in keeping the fetus, the general brown discharge will last longer, will be more than a week or half a month, and even will always have dripping brown discharge. If you have a miscarriage during pregnancy, you should strictly follow the doctor’s instructions to use medication to protect the fetus, and observe the fetal development after using the medication, such as one week after the birth control and brown discharge need to go to the hospital in time for review, and to give targeted treatment.