I agree with Mandi. A baby is a full-time job in and of itself. Juggling a baby and school is going to be extremely tough. It would probably be a better idea for you to finish high school, take a semester of college and get an idea of how upper schooling feels. College is much harder and more intense than high school, and many college freshmen end up dropping out because they can't handle it... and many of them don't have young babies at home to further distract them.
If things are going great now (financially, relationship-wise, etc) think of how much better they'll be in a few years when you have school behind you! You'll be able to devote more of your time and effort to your baby instead of dividing your attention between school, work, and your family responsibilities.
17 is so young, and you have so much ahead of you. There are plenty of years ahead to have a baby. Don't you want to wait until you can give your child as much of your undivided attention as you can, instead of purposely taking on all these things at once?
We're not saying these things to be mean. We're saying them because we have our own babies and understand first-hand how much work they are. We're trying to help you.