Holly, you have gone through so much lately that it really spins my head. But, you've mastered mostly all of them very well, and you will also master this one.
Right now, try not to let yourself get stressed out by the mobbing you are going through. These people would probably kick a dog that's already down and enjoy every moment of it. They will probably push it to the legal limit, and if you have documentation and/or witnesses, you can take them to civil court later. You have your talents and know it. Right now though, you have a much bigger job ahead of you - and the hell with the money - you'll get support, I'm sure, from Pete's folks, you step dad, and all your friends. They will all make certain that you will not starve and get the proper nutrition for you and the baby.
Also, they will be there for you when you feel stressed - and that's very important. So swallow your pride and accept all the emotional, financial, and other support offered. If I were there, you'd be staying with me.
I kind of suspected that Pete would not totally distance himself from you, he is after all a human, and we all make mistakes. He just needed some time to adjust to the present situation and realize the change in your lives. Nobody is a 100% perfect, but as long as we are still breathing there is room for improvement. I'm also sure that deep down you still love him very much, and will probably be willing to forgive him. And guess what - this is OK. A lot of couples go through one crisis after another, but surviving them makes them stronger.
The current issue at your workplace will also pass - you'll have time to think about what you could do with your talents - maybe even get a job that makes you happy and content. Your main job now is your child, a year or two of attention for him/her, no matter what you have to do without financially. Money is nice to have, but it is not everything.
I truly wish you all the best, dear, and I'm sure you'll eventually see a 'light at the end of that tunnel'.
Lots of love and best wishes,

Chery
Someone will always be out there to give you a hard time - place yourself above them - they are pitiful.