Okay so I was supposed to expect a visit from AF on 2/9/13 but on the Feb 4th my bf & I had sex & we used no protection nor use the pull out method. I was about four days late but had some light bleeding & discharge & through out the days it got a little heavier but not like my period usually is. I've felt some cramping,headaches , some nausea etc. can I possibly be pregnant ?