Everyone who has said adoption in this thread:
I don't think you understand that after carrying a child inside of you for nine months it would be pretty horrible to put it up for adoption and never see it again. So, you're creating two traumas for yourself, knowing that you were raped and knowing that there is living proof out there somewhere sharing yours and your rapist's genes, and that it is out there - your child - is out in the big wide world and you'll never know if he turned out good, like his father, died, etc.
If I was some bitch that got raped I'd abort, because keeping it would be a constant reminder and adoption would be pretty shit too.