I had unprotected sex with my partner about three times now. The first time was sometime beginning April. and twice since then with him ejaculating inside me. Since then in the begining of may I bled lightly for two weeks non stop with a bit more flow the last two days. two weeks later it happened again, two weeks of light bleeding followed by what seemed to be a normal period. Yesterday as I wiped I decided to check for the "unusual bleeding" and it is there again. Two weeks later the light bleeding has started, and it remains today. I wonder if this is a sign of pregnancy? I have taken 4 PT and they have all been Negative. I am used to a fairly normal menstrual period, I used to get it once a month, no more than three or four days off. I am really worried that I am expecting, please advice.