Overly Paranoid about sex

I've been on oral birth control for almost a year now. I take it every night (never missed a pill) at 10 pm. My boyfriend and I have sex about every 2 weeks. We use a condom and he pulls out. I still stress out. Don't know if it's bc of my anxiety issues or what but I get scared of precum contraception. Any advice? It's making sex hard for me to enjoy when I WANT to enjoy it!