Birth control

Amber • I'm from ATL, I have been in serious relationship for 3 years. I am an artist and vegetarian.
My bf wants to have sex with out a condom so I am going to get on birth control. A friend of ours says she's been on birth control for years now and her husband finishes inside her and she has not gotten pregnant. Will birthcontrol prevent me from getting pregnant or will I still have to be careful?