I had unprotected sex on 12/26/12 and on 1/6/2012. My last period was 12/10/12 and from November-December my cycle was 39 days. I have not been feeling well ( headache , sometimes nausea but no actual throwing up, exhaustion but having trouble sleeping, fluctuations on appetite , mood swings which are out of character, and had cramps on 1/11/12). Could I be pregnant?