Seeing that your 15 and she's pregnant, your going to have to talk them into it with a good enough reason. If she is the same age as you, and pregnant already, then her parents are going to have their guards up and not allow you to take their daughter from them. She should be by her parents now though, she will probably need them more than ever. However, if she wants to move in too, sit her parents down and give them a good enough reason as to why you got her daughter pregnant at whatever age she is, and want her to move in with you. I don't think it'll matter what we say though. Your girlfriend should try talking to her mum. Girls have his bond where they can understand each other. Let her tell her mom how she feels about it. She is her parents daughter afterall, and her mum should be the one guiding her right now, especially that shes pregnant. Not much you can say to change their minds.
You really don't want to move in together at 15. Finish school first. Be completely involved! Make sure you help your share with the baby and encourage her to finish school as well. Taking care of a family is a huge responsibility. Which you have to do now anyway. but make it a little easier on yourself. finish school, both of you. Get a good job that can provide for you and your now family. With you being completely involved now her parents will learn to trust and accept you and everything. They will also gain a huge respect for you. the fact you finished school, got a job and all the while loved, supported, encouraged and took responsibilty for their daughter and your baby.
Omg you're15yrs old,you don't!.Let them(her parents) take care of her but just make sure you will be present to help if the need arises. You can visit and help-out any way you can bt don't ask her to move-in with you leaving with your parents,just don't.
You should just go with your friend to her parents and sit them down and try and talk like adults, it probably won't work but tell them you think its for the best, and that your parents are okay with it, even if it is just while she is pregnant.
I know I've already done something completely irresponsible and idiotic, but trust me anyways.
You are 15 and she is ???
Good luck !!!