HELP-LONG SHOT

I have completely misunderstood my maternity pay and just found out I don't get paid for the last 13weeks of my leave! 100% my fault, I think a mixture of general pregnancy anxiety, my HG and furlough I didnt understand.

Work will not take me off maternity leave or furlough me again so my return date is still June (1year)

Long story short I need to make £500pm cash for 3months or there is a REAL risk ivwill loose my house.

Any ideas, I have nothing to sell in the house we don't need (I'm pregnant again and we live very minimal as we have a very small 2bed house with 2adults, a teen, a baby and im due in Sep)