I second the above advice, all of it. You need to talk with your OB, and right away.
Please read this, meth use during pregnancy is nothing to mess around with:
http://www.webmd.com/baby/news/20050727/1-hit-of-meth-is-too-much-in-pregnancy
Best of luck to you, I hope you get the help you need, and soon.
You need to see your OB and talk with them about this. How far along are you?
Is there such a thing as "too damaged" when talking of a baby? Isn't any "damage" too much? If you take in poisons be guaranteed that this is harmful for an innocent fetus.