How to start the conversation

My boyfriend has been with me 8 months and I lost my virginity to him unprotected because it was in the heat of the moment, but I'm very serious about protection and I want to talk to him about condoms. His mother is very strict with us, not even really letting each other touch so if we want to do anything he has to go to my house. Because his mom is so strict, he doesn't want to get caught with them. I feel like i can't do it with him again, without knowing he is protected. I have generalized anxiety and I don't need to worry constantly about maybe being pregnant. I've been on birth control for over a year now, so we're protected on that end but I don't want to risk it. We are both 17, turning 18 in April by the way.