Hi...I am not bi-polar...but I do have some experience working with such people.I am also in recovery and have dealt with my own depression for some time now.I'd like to welcome you here.
Please know that you are in no way responsible for your husband's anger.You are doing the best you can under extremely difficult circumstances.You have taken care of him and he is safe.
Now it is very important to take care of yourself.This needs to be your first priority.You have the baby depending on you.And you deserve as much peace and happiness as possible at this time.That's important for your health and for your baby.
Don't exhaust yourself with worry over the things you can't control.You won't be of any use to anyone unless you take care of yourself first.Most likely,when your husband is back on an even keel,the anger will fade.Even if it doesn't,keep in mind that you do not deserve it.You didn't cause this and you are not to blame.
And so...be good to yourself.Do things you enjoy.Get ready for the arrival of your little miracle.Eat well and rest.Be peaceful.
Good luck and keep posting
phoenix