random but need to know

Hi ladies! Quick question and I hope it's not to awkward. So this is my 2nd month/time trying to get pregnant. Whenever we BD I feel like so much of his stuff comes out all over the bed, my undies and it's like how does he manage to get up inside me if it just seems to come out. Or maybe he just has to much cum? Do I sound dumb haha. It's just I'm scared so much comes out none stays in