I had my last period on 1st december. I have a regular cycle with average 32 days. I had unprotected sex on 24th and 25th. I had high fever and headache on 11th dec and it lasted for almost 1 week(ovulation expected week). I had one drop brown spotting on 31st dec. My period was due on 2nd january and now its 9 days late. Sometimes I feel cramps and I have breast pain. I took a preganancy test 4 days after my period was due and it was negative. Could I be pregnant?