While I will disagree with Amy on the point that a child needs two parents to turn out well (just about every friend I have comes from a broken home, including Rick, who is the most well-adjusted person I know), I don't see why the suggestion of adoption is so demonized. Remember, this is a discussion about the best interests of the CHILD, which should come first in any situation. Depending on the severity, its hard for some Cystic Fibrosis patients to take care of <i>themselves</i>, let alone a child who can't do anything for itself and is completely dependant on the mother. And that's aside from the complications of a messy divorce and abusive husband.
Vampy, while I find your situation difficult and can understand the emotional ramifications that may come from putting your child up for adoption, I urge you to at least keep that suggestion in the back of your mind should your situation become all the more unstable. I am also with Debbie in questioning the judgment involved in this entire mess. For me, the real question would be as to why anyone would even risk pregancy with a man they did not intend to marry, but that goes way back and is neither here nor there at this point. I will admit that I don't even know the whole story, but based on my moral judgements, the whole thing seems out of place.
Either way, however, I do hope that you can get yourself out of this situation safely, Vampy. But please put the interests of the child first, whatever you decide.