Had unprotected sex on the second day of my periods that is 14th sept and my periods ended on the 15th.... However his penis did not enter my vagina fully as it was my first time it was only for 2 to 3 mins he didn't even ejaculate but on the 16 i had unwanted 72 just to be safe and 7 days later i got spot bleeding but this now i haven't gotten my periods..Had my periods on 13 sept last month n ended on 15th ...what are the chances of pregnancy