I had unprotected sex over the wknd and on monday i noticed brown discharge on my panties.it thursday and i still see it..period is due in 4days,?

Pg test in 6 days: Anytime vaginal bleeding is abnormal, in length, symptoms, or timing, check a pg test to be sure (if you are sexually active and have not had surgical sterilization). Repeat in a week & if negative, and you miss another period, see your doc to find out why. Follow the instructions on the kit, & be sure it has not expired, too. Also, infections can occur, if you are at risk of pregnancy. See doc.