Hi and Welcome Jaaziel!! And contgrats on the new baby on his/her way.
I've been doing the breadwinner thing since day way...way before H left us. I will admit I was a bit of a work-a-holic myself. I had to cut back my hours at work once the baby came and then I scaled back even further once H left and I had to out our DS in day care. Although I sill work a 45 hour work week typially w/ a 70 mile a day commute. I know a lady on another iV board that LOVES her work-a-holic lifestyle and swears she would not be able to stay home. Her DH is a SAHD and it works out great for them.
Everyone is different, just like every baby is different. It'll be hard to say this early in the game as to what will work for you. Is your DH able to care for baby w/ his health problems? What are you expecting from you? And REMEMBER...once baby come (or even before if you get put on bedrest or such) baby changes everything...so be willing to be flexible and things should be able to work out ok for you.