Well, this would be my suggestion, since you do seem very bright, compasionate and like a very smart girl don't try to get pregnant. You are only 15 and raising a baby is going to be hard, no matter how much experience you have, not to mention a child puts a strain on a relationship. Now with tech schools you can graduate up to two years early right? Well do just that, graduate early, and start working on your dreams, if it is to be married to this guy, then marry him when your a little older. Many couples have one or both of them in the service and do just fine! Now I am not trying to preach or say that your idea is wrong or that you are in no way capable of this, because I believe you are, but I am 17 and living with the father of my daughter who is to be born on october 15th. While our relationship is still really well, we don't have a crying baby, dirty diaper, etc yet. I am to graduate in may and currently on bed rest. My bf is 20 and works full time and while we are excited, I am scared at the same time. Just wait it out a little longer, it seems as though he loves you too and if that is the case he will understand that you need to become a legal adult before you can commit to a permenant decision.
Good luck and best wishes
-jessika-