Need help

I’m stressing about money! I’m 29 weeks and 2 days pregnant and I am working I started off working about 35 hours a week and where I work in a pub my hours have recently been cut down I’m now doing 19 hours which is shit as need to pay for stuff still. Can anyone explain to me about maternity pay? And how much you get and when people took there maternity leave? My other half is saying that he will work over time so that I can leave work early as he knows how much I don’t like working where I do and we both feel my work is going to try everything they can not to pay me.