First of all, you are so, so brave. I really admire you.
The first step might be telling your parents. It will be hard, but worth it. Especially about the rape - an adult needs to know about that right away. If it makes you more comfortable, take a pregnancy test before confronting your parents.
I think you're making the right decision about not aborting the baby, and I'm so glad you're going to stand by it. I know you're scared, I can't imagine how scary this must be. Please don't hesitate to
PM me if you want to talk.
Good luck,
Sam