Sorry you're struggling😞 Have you tried foodbanks or local charities like CAP (a charity who support people with debt coaching, finding work or budgeting).
Have you tried credit union? They can give you loans from like £500 no matter your credit history. You just pay abit out of your child benefit weekly. Also universal credit if you haven’t already, you can get an advance too, we got 1k when we was on it and paid £40 a month back x
Have you seen if you’re eligible for universal credit or gone to your council for help? When I was pregnant, it was just me working and my local council said I could get financial support even though I was private renting. I didn’t end up taking that option but the option was always there. Also my workplace offered help as well and at the time my university provided me like a hardship fund of 1.7k so that was also really helpful. Have you spoke to family or friends to see if they could maybe help in some way? I know it’s not ideal but if push comes to shove you could always ask x