That's a lot to have to deal with. Handle one issue at a time. I'm not sure what type of bills came in that are larger than expected but call the company/creditor and talk to them and see if you can work out a payment arrangement or defer payments. Call your mortgage company and ask about deferring a payment for a month or two.
I find that if you let your creditors know what's going on they are more likely to work with you
before you get in big trouble and things start going on your credit.
You may not what to do this while pregnant and being likely "off-balance", but later you can probably look for a used bike on craigslist. You'll still get exercise going to and from work but you won't have to spend so much of your day in transit.
Also, can your husband use a temp agency for some extra work while he's not getting construction jobs? Sometimes they have jobs just to help move offices, furniture, paint, etc. This might help cushion the blow between now and when he gets regular work again.
Good luck! Hang in there!