Help! Work advice

Hi! So I am desperately looking for a new job but this is the worst time as I’m ten weeks pregnant. I currently have a job but the stress is unreal and I’m sure it’s not healthy.

What would you do in this situation? How much maternity pay am I going to miss out on if I get a new job now? (Money is quite with this job but I know I can get better pay if I move on too). Based in the UK.

Thanks for any help!! X