What you need right now is a lot of communication, STAT!!!!
Get your husband home, make him bring his lady as well. The three of you need to sit and come up with some sort of peace before the baby drops. You need to put exactly what you need on the table, so does he and so does she.
Then, you need to start negotiating. I've never had a kid, likely never will. However, I've seen a bunch of friends go through the process. Methinks, and this is just me, that you don't want to be the only one getting up in the middle of the night to calm a screaming infant. You are going to need someone there for support. Maybe that's him, alone. And maybe that's her, too.
Good luck. Try not to go insane.