Hi, I am on a prescribed tri sprintec birth control pill. I take it for three months straight but on the last week of month three I take the placebo. I have been on this for two years for ovarian cysts on the inside of my ovaries. However I made the mistake last Thursday and had sex without a condom but he did not do anything in me. I know there is the possible pre though. On the same day a few hours later I had a dark brown discharge and had a period that lasted around three or four days. Is there a chance I could still be pregnant? I also compete in running and that Friday and Saturday I raced and I still did great. I need to know if there is any possibility that I may be pregnant if all I'm getting is gas, a gurgling sensation, and small cramps not to bad though.