I just want to say... Firstly congratulations! From experience we got pregnant, I had the baby in my home country and its possible to get the baby registered as a US citizen. It will probably be easier for you because you guys are married. I'll be honest it was not great doing Pregnancy by myself but my partner came over for the birth and I'm sure that would be doable for you guys!
Just remember to look after yourself as much as you can, try not to stress too much about the situation And try to plan things as early as possible.