Hi I had sex 11/7/12 but I'm getting relly bad pregnancy symonths I got my peroied on 14/7/12 but only lasted 3 days could I be pregnant

Hi I had sex on 11/7/12 I got my peroied on 14/7/12 it normaly lasts 4 1 week but ony lasted 4 3 days I'm getting relly bad lower belly cramps sickness feeling dizzy urinatin a lot sore boobs getting tired eazy . I went to my doctors for a urine sample it came back negative but she took the sample when I had my peroids is there a possibility I could be pregnant

Could I be pregnant

Really, as you have had a DOCTOR test as well as a period the chances are neigh on impossible.
So NO.