Started the first birth control (Junel 28) pack May 27, twelve days before my period. Had unprotected sex June 10th. I started "spotting" the day after I was suppose to get my period which was June 8. On the 13th I started to get my "period", and it came heavy started out light that day then went straight to heavy by night. Having cramps as well and it's dark brown reddish. Still on my first pack of birth control, 3 more days to go before the placebo. is there a chance I could be pregnant