The presence of a brown discharge after taking oral contraceptives suggests the presence of withdrawal bleeding caused by an adverse reaction to the drug. The brown discharge may exist due to causing a small amount of shedding of the endometrium, as the bleeding is relatively small and enters the vaginal oxidation. When this occurs, it usually ends within 3-7 days and it is recommended that it can be observed. If brown discharge is still present for more than 7 days, the first thing to consider is whether there is a chance of pregnancy, because brown discharge may also be present in pregnancy, which can be ruled out by a blood test for HCG at the hospital about 8 days after intercourse. If it ends within 7 days, you can take a test about 12 days after intercourse to rule out the possibility of pregnancy. If you are not pregnant, you can wait patiently for your period, and the brown discharge will not affect your health within a short period of time.