My period use to last 5 days but these last 2 cycles they lasted 3 1day period flow was heavy 2nd day medium flow and 3rd lighter and the other 2 only saw discharge when I cleaned myself.. I got my period on sep 8 but I was suppose to get it in the 12... I had sex in the 13 with no protection, I was suppose to start ovulating on the 20 but I notice I was ovulating in the 17-21... what are my chances of becoming pregnant?