Is it possible to get pregnant

My boyfriend masterbated earlier in the day but right after he peed and jumped in the shower so there was no pre cum at that point when he came to my house we started making out and one thing led to the other and he was slapping and rubbing his penis on my vagina nothing went inside my vagina he was just playing with it but I'm not sure if he had enough pre cum to get me pregnant what should I do ?