hi im 18 and yes i am sexually active about 3months ago i had a lot of on and off stomach pains i didnt know why at first but my doctor had informed me that i had an std.i got treated for it and the pain stopped and there was no more burning or itching from the vagina .now its been about 2months now and i have been using a condom all the time now but now i am getting a wierd pain in my stomach again and a brown sticky discharged what does that mean