SOMEONE GIVE ME A PIECE OF MIND

my boyfriend and i have had sex 4 times without a condom and twice with since we have been together .. he pulls out each time and I am on the combination pill which I take everyday on time. I still freak myself out that I could be pregnant and I make myself sick over it. I feel like I need to see a therapist because its so hard for me to put my trust in a tiny pill .. not to mention he has a son so I feel like he’s fertile myrtle .. someone please give me a piece of mind :( I wanna be able to enjoy sex with him and not have this on my mind every time we have sex