It's a good idea to ask for what you want.
It's really hard to be in the work world. It's brutal.
If he asks a question, answer truthfully; don't be offended that he asked; few people can really read minds.
Realize that you are especially vulnerable right now.
Ask one of your mothers to come help out with the baby.

These are just some ideas. It's wonderful that you're having another baby. That's really exciting.