boyfriend fingered me with cum on his hands

so my boyfriend and i had sex and he came on his hands, he wiped them on a towel and then fingered me (I don't know how long he waited to finger me, but I'd say about 2 or 3 hours), will I get pregnant even though they were in open air and water (we had a water balloon fight)? thanks :) (we just had sex today and I haven't taken contraception)