There are laws here in Texas that prevent a divorce during a pregnancy, to keep from 'bastardizing a child'. The assumption is that the legal husband is the legal father, unless you provide proof of paternity, which cannot be done until after birth, I believe. You might call an attorney and ask about the birth certificate--I don't think she can put anyone else but her legal husbands name, but I'm not sure. Bottom line--I'd get in a hurry to establish paternity from the 'git-go', as that would be grounds to petition for a divorce and request that child support not be granted. Until then, you're probably stuck. Ask an attorney to be sure.