Big Decisions

My boyfriend and I just decided that we are ready for a baby. The only problem is I'm 17 and still a senior in high school. He has a job and so do I and we're ready for this next step. I know there's big changes and some downsides to this but we are so ready to take this next step in our relationship. But part of me thinks we're jumping the gun and getting too excited. I need some help and opinions of what everyone else thinks. please!!