Hello and welcome to HCM. Thank you for your query. First of all, your age was very important to help guide you through a provisional diagnosis. But, as you are sexually active and on birth control pills, I am assuming you are in the reproductive age group, and so we shall accordingly consider a few possibilities. Let me start by listing some of the most common causes of brown discharge for you: -Premestrual (spotting that occurs prior to a period) -Implantation bleed -Hormonal imbalances -Fibroids -Ectopic pregnancy -Miscarriage -Normal in some women -Polyps -Around menopause and a few other factors. Before assuming any other causes, I would like to start by asking you to conduct a home pregnancy test using an early morning urine sample, as this would yield a most effective result. This should be conducted at least 20 days after the last sexual contact or on the first or second day of a missed period. This test might have to be repeated at least 2-3 times to confirm a result. As you can see, the causes vary quite a bit. I would thus advise you to visit a doctor and get yourself examined and investigated thoroughly so we can rule out the worst and treat you if required. Early management is the most effective. I hope I have succeeded in providing the information you were looking for. Please feel free to write back to me for any further clarifications. I would gladly help you. Best wishes.