If i leave my boyfriend i want to wait to leave him until after i have the baby?

Do you love this guy? Does the current guy know you're even pregnant? Too many variables unknown to really give a good answer. Assuming the boyfriend is the father and you don't love him. He has rights concerning the child, but you don't have to stay with him because you're pregnant.
If you love the other guy and he doesn't mind you being pregnant, then leave the boyfriend, but he needs to know about the baby.

What, you want your boyfriend to hold your hand until you have the baby, then ditch him for the new guy? That stinks.

I honestly dont really have a whole lot of experience with the being pregnant or boyfriend issue, Im gay, but I have been with women with children and so on, Ive seen fathers before, during, and after the pregnancy. I dont know this guy, I dont know you, or the other dude, but I know that if you are going to stick around and make him deal wit ha pregnant chick, and then try to leave him, with his child, to go stay with another dude, it might make him a little upset. But if you guys can be mature about the situation, and work together, im sure this could work out for you. Just, He needs to know about that baby, and know what you wanna do, Hopefully you guys are mature about this, Cause try and think Reeeeal hard about it...but... There does happen to be a child, YOUR child, growing inside you, and you need to take care of him/her before anyone else.