I need sex/relationship advice

So I’m in a long term relationship and I love my boyfriend but I’ve been really struggling because I don’t trust my birth control. I haven’t been sexually active very long and it’s starting affect my mental health. I take the pill perfectly and we use condoms but I still don’t trust it. Anyways, I’m staying the night with my boyfriend and I don’t want to have sex with him tonight, cus I’ve just got this feeling that my birth control isn’t working. What should I say to him tonight?