Sex?? Cum?!

I let my guy cum in me all the time, we both don't mind a kid, but I just don't really want one right now because I have so much good going for myself and he does too. We can do it, but I just think too much good is going on. I haven't got pregnant yet', but I'm thinking it is going to happen. My guys cum is very watery like vs thick... Does that have anything to do with why I haven't gotten pregnant yet???