I've read most of the other replies.
I'm reminded of something JK Rowling said
'I reached rock bottom and so I made rock bottom the foundation of my life'.
This is a big shock for you both. However I would gently suggest you are nowhere near rock bottom, thouigh you may think you are.
The first priority should be your mental and physical health.
It sounds like your partner was very close to a mental breakdown. So if you ask me it is a really good thing that this has happened. Perhaps after you get some sleep you will say this to him. And tell him you love him, if you still do.
Second, I know this is difficult for you, but really you are nowhere near rock bottom here. Take that in. There are millions of families across the country who are making choices between heating and eating here. Not least the millions of refugees who aren't even allowed to work, even if they could. And the millions of kids who can't access mental health services. And the hundreds who commit suicide because their benefits have suddenly been cut and they can't deal with it.
Yes, this is true.
So I may sound very harsh, but compared to that, you are actually very, very priviledged.
Change your mindset and begin to value what you actually have.
Today. And everyday.
You are going to have to do what millions of us have always been doing for years.
Check your bank account everyday.
Do a budget as others have said.
Cut your outgoings.
There is enough information out there to do this.
It is tough being pregnant and experiencing these changes.
But there are far worse things. Believe me.
You are not a single parent, and you have a partner who can help you.
I would say again, it sounds like your partner was in a toxic work environment and for all the money on the planet that is not worth it if like someone has already said, it was driving him to tears and worse.
There is another saying
'A criis is also an opportunity'.
You are not on the breadline. You have resources, an education, and a telephone. As well as a supportive family.
As someone said, you are millionaires.
Change your values. Sounds like your lifestyle was not sustainable any which way you look at it.