pregant and confusion

so my boyfriend is a marine. I think I'm pregant due to my late period. I have talked to him about it and he wants to keep it and start a family. I don't want to rush into marriage because I want ours to be successful. I don't care about the health benefits. I personally would not want to keep the kids. any thoughts on how to let him agree because he has stated many times that abortion is aginst his beliefs. or on what I should do. besides I'm only 17 and he's 20. so I also don't want to get him in trouble.