I agree with Annie. Your doctor would be best to advise you on that. In my own personal experiance (I have a messed up lower spine and pelvis) and it just caused more frequent pain on the right side and makes it hard to walk. What does he think pregnancy will do to you? See if he's sure he wants children, and if you're both really ready see a doctor and talk about it.
I'd be talking to a doctor, not just to someone you know who has done some research. Then, I'd talk to him about whether he wants kids, now or later. It's really two issues, one being whether you are physically wise to do it, and the other whether he is ready to have children. 19 is pretty young.