Advice: Should I tell him?

I'm going to start birth control, but I'm reluctant to tell my boyfriend because I don't want him to try and convince me to have unprotected sex with him. We've only had sex once but we're planning on doing it more and soon, but I don't know if I'm ready to have him cum inside me, though I know he wants to. Help? Should I wait to tell him until I'm ready to have unprotected sex? Or tell him the truth and hope he's not disappointed?