I presume you mean that he came into the water, not in your vagina. It is highly unlikely that any sperm got into your vagina, but not totally impossible, thus pregnancy is highly unlikely but not totally impossible.
Thanks for the answer, Yes I mean he came in the water not my vagina. He pretty much came on our chests, so I was hoping it wouldn't get me pregnant, cause I dont want to be yet. That is why I am not having sex.