Help...

Me and one of my closest friends have recently had a talk about trying to have a baby. I'm in a relationship and so is he but neither one of us are happy. He has already left his girlfriend and I'm in the process of it. We have been bestfriends for almost 9 years and we got pregnant 3 years ago and I miscarried. It killed both of us but we have almost bounced back stronger. I love him with all my heart. There's nothing I wouldn't do for him. We have never tried to be a relationship but I want a child and so does he. He has always always always had my back. When my mother past he was there. He's always been my rock. I don't know what to do here..can somebody give me some insight?