Birth Control

Hanna
Recently, my very conservative and Christian  parents found out that my boyfriend and I were having sex. But the discussion was kinda ignored; they weren't mad because I told them the truth and what not and everything is resolved. 
What I'm wondering is how I should ask my mom if I can be put on birth control? We've been using condoms. 
And what is in your opinion the best brand of birth control? 
Thanks for any help!!