I had sex on the 13th December, then again on the 19th but I was on my period on the 19th, I had sex again on the 28th, I was off my period however, I've been getting reallyour bad backache, stomach cramps and my stomach feels heavy and bloated, I go dizzy now and again, I'm tired more often, and been moody, I have no idea when my period is due again however is there a possibility I could be pregnant because I'm scared, my stomach also feels a tiny bit harder however it is flabby, and my breasts feel tingly