I want me and my boyfriend to have a baby. He doest know I do. Should I tell him?

Well don't purposely sabotage it so he does get you pregnant. Let him know what you want and see if he even feels the same. This is in adolescent though, so I'm guessing you are a teen? If that's the case, why are you in such a big hurry to have a baby? If he doesn't want one, don't force him into it.