Here is the deal. If they end up sending you to a clinic, you will first meet with a conselor. Tell that counselor that you don't want the abortion, that this is being forced on you against your will. That should settle it right there. When you get pregnant, you just about automatically get "emancipated" meaning that you get to make your own decisions about your own life.
Your family might try to pressure or threaten you into having an abortion (the "you will have to move out and we'll never talk to you again" is a common ploy). But you can not be forced to have an abortion. They can not strap you to the table and perform an abortion just because your parents insist.
Generally, I am not a fan of the crisis pregnancy centers, but this might be a situation where they are appropriate. It all comes down to how vehemently you want to continue the pregnancy. If you are willing to do anything, then you will end up going through the pregnancy. But it comes down to whether you are willing to defy your parents. That is really the decision you need to make now, as you already decided to keep the pregnancy.