First of all, I'm so sorry that you're going through this. Marriage to the military brings a whole new set of challenges that most civilian marriages don't have to deal with. None of it is easy and it seems like there is always some kind of extra stress affecting things.
The ony good thing about the military is that there's all sorts of outlets for free counseling. Militaryonesource.com offers free, anonymous counseling that you can even do online. There should also be a Military Family and Life Consultant within your husband's unit that is also free. I don't know what post you're at, but on our MWR page it has phone numbers for general post MFLAC counselors and other referral resources. This can be for indiviual or couples couseling if he's willing. They also offer classes such as "Parenting and Divorce" or "Divorce and Money".
I would absolutely pay a visit to the legal office to make sure that all of your bases are covered. Maybe check and see if your powers of attorney are updated, just in case you need them.
Again I'm so sorry that you're going through this, especially on top of a pregnancy. I wish all the best for you and your family.