Stressed out mama-to-be

So my husband is as nice of a guy as I could reasonably expect a person to be. Just for the record. He's amazing. He works his ass off to provide for us. I basically work part time (I have other responsibilities other than working and taking care of our household chores).

So far we've gotten by. But now the baby is coming.

We have discussed this before, but the other day a very good employee quit the company he works for to be a full time SAHD. So my husband comes home and basically tells me how jealous he is because he would love to do that. And I would way rather work than be a SAHM. It sounds simple, but it isn't.

My husband works full time (and then some) and brings in good, steady money. I have my own business (one other employee) and I think I'm going under. I realize that it's better to not make money than to lose money every month. So here we are.

So we can't give up his job, but every time money comes up lately it makes me feel like such a failure I can't even cope. I don't know what to do. The stress is killing me.

And now isn't exactly the time to job hunt because I'm more than halfway through my pregnancy. I feel SO stuck. And useless.