Right or Wrong...Adults please answer!?

I need some opinions. Ok im 17 and im engaged ..we've known each other for 5yrs. We REALLY want children and we want to start early. Im going to college to study to be Obstetrician or Gynecologist. He is about to own his dad's bizzness. So money isnt the issue here it's time. My plan is to go to college and finish wait a yr or two then buy a house then start a family. He wants to start a family next yr. i think its going to be hard trying to take care of a family work and go to school. So please i need some opinions about this. Oh his parents are okay about the idea of having a child now but my parents would probably kill, but they dont know about this though but his do.