Well, lately I have been having both cramps and back pains. It feels like i'm about to come on but I haven't been on since sept. 04. I really don't know what's going on and i'm on birth control. Could there still be a possibility of me being pregnant? I checked with my doctor and he told me my test was negative. Do you think I still have anything to worry about? Me and my boyfriend always have unprotected sex. Do you think I can be pregnant even though i'm on birth control?