Should I be worried?

Gloria
This guy and I were having sex at the beach in the water. He wasn't really hard and it wasn't like full on sex. Like I was on it for a little then got off. The only thing I'm curious about is i don't know if there was precum and if there was could I be pregnant? I checked my calendar and it said I did it on my most fertile day but I feel like that is never right. Should I be worried?