Pregnancy scares

My boyfriend and I are sexually active but i have very christian parents and if they found out Id be in a lot of trouble, therefore i have no access to birth control (i’m under my moms insurance and if i got any she would be notified). So every time me and my boyfriend have sex I get paranoid that I’m pregnant. We still take precautions. He wears a condom every time and he pulls out a good 15 seconds before he cums, but i still get worried. Am i just being paranoid?