is two really better than one?

my boyfriend (like a lot of guys, i’m sure) loves to cum inside me. he has been satisfied with just cumming in my mouth, but now has asked to ejaculate inside me during sex. i’m on birth control and i am very good about taking it, i know how effective it is when used correctly but i am still concerned about pregnancy if i was to let him cum inside me. i realize two methods of birth control (pullout and the pill) would obviously be better than just the pill alone, but am i really putting myself at a notably higher risk by letting him do this? any personal experience or advice would be appreciated! thanks ladies!