Pregancy SCARE!!!

Ok me and my boy had sex yesterday and I'm on the pill. He had a condom on and didn't get off but his mom walked in and he hurried up and pull the condom off well it was our last one so he put it back on and he doesn't no if he put the side was on his dick on the outside I'm worrying about being prego from Precum  then a few hlurs afterwards I went to pee and I wiped and there was this blob of jelly like stuff that look like hair gel and it was the size of a quarter maybe a little bigger and idk what it is or if it's a sign of beig prego.