I am a 25 year old female and I have had constant brown vaginal discharge and light bleeding for over a month now. I had a colposcopy a little over a month ago, which resulted in negative results. I also have been on birth control ever since my colposcopy, and the bleeding hasn't stopped. Its mostly a thick brown discharge though. I was tested for most other STDs and all the results came back negative,I have even tried to eat a better diet and take more vitamins as well as get more excersise. What is wrong with me?