Can you get in trouble with the law for moving out at 17 while still in school?

No, as long as you can continue your schoolwork. Think about it.. you can move out at 18. Some people turn 18 when they are still in school. It won't harm anything. As long as you keep up with your schoolwork, you have transportation, you have a designated place to stay, and you are able to support yourself as far as your income goes.