Please help!!

I’m 16 almost 17. I am sexually active and I am very careful (always use protection). Lately, I’ve been thinking about taking birth control but idk how to go about it. I don’t want my parents to know I’m sexually active because I come from a strong Christian family and they would make me stop seeing my current boyfriend. My mom is more understanding than my dad but I still wouldn’t know how to talk to her about this without her getting mad. Please give any ideas you would recommend on how to talk to my mom or ways to get birth control without them knowing!!!