When I Was Having Sex He Was Laying Down And

When I was having sex he was laying down and I was on top and he was penetrating deep I noticed I was bleeding! It wasn't a whole lot but enough to to where I was a little concerned, I have never had this happen before and this is a new position that we tried! I did stop bleeding within a min maybe but I'm super scared and panicked! Can you maybe help calm my nerves and tell me if I should be worried??