i had sex 2nd and the 3rd of november. my period should of been on the 4th, but i was a day late( came the 5th).while i was on my period this month it was lighter then its ever been before. then on the 3rd day( makes the 7th day) of my period it was like i was not even on my period was spotting until the 10th of november. then on the 10th my period was over. could i be pregnant?