hi its 50/50 chance then if this was within the last 72 hours get to plan b unless your g/f is not worried as perhaps she wants you to father her child? for now if its past the 72 hours is wait. good luck
possibility of pregnancy. i was having intercourse with my girlfriend a week after her period. i had just finished for the first time and removed the condom. the first condom i used had spermicide lube inside and outside the condom. then when i went to put the second condom on (no spermicide lube) i put it on the wrong way. at the time i still had my sperm residue on the tip of my penis. i quickly flipped it and tried to dry off the condom. i continued to use the condom that i flipped to have intercourse.