My period ended on a Sunday and I had sex on Wednesday. During sex a heavy brown discharge with an odor came out of my vagina. I have made an appointment with a doctor but it is not for a couple of weeks. I would like to know if anyone knows exactly what that is and what could be wrong? My left side of my back has been hurting on and off for about 2 months. Now it has been about a week and a light brown discharge with odor come out now about every other day. Today I am feeling a little weak and am not sure what's wrong. If i do not get any replies I will definetly go to the doctor today!! Please help me if you know anything that could be wrong! thanks!