Brown discharge a week before your period, i am on birth control and had sex the week before?

One-time symptom?: A doctor can check to see if there is a medical issue if a woman has mild menstrual-related symptoms. Many women have some variation of their mucus discharge, of their periods, or a missed period on occasion. Some women feel normal after a few days, but others have bothersome symptoms (such as an unusual discharge) and go to see a doctor. Symptoms may be due to occasional fluctuations in hormones.