Can I move out if im 17 an pregnant an mom wont help support me?

Not for the Doctor. I am not sure why you would ask strangers this question. Can you afford to live on your own? Pay your bills? Provide yourself health care? Prepare to buy clothes, food, and furniture for the baby? Your question is not for medicine to decide.
I believe you can. Move out at 18. Is this something you really want to do? Having a baby at 17 is a very hard thing-especially with no support. I can tell you from personal experience that an open adoption is a very cool thing. You can watch the baby grow up with a family that you pick. It gives you a chance to figure out what you want to do with your life. And you can give the best gift in the world to someone.