HAPPYJOB most of us have been there. I have a 4mth daughter. My wife and I knew before we had the baby that Maternity Pay is a joke, but we knew we could get through it.
Yes we have struggled but you DO get through it. Family and friends help, you get lots of clothes via presents etc, stop panicking. Lots of poeple have kids and have mortages and bills to pay, and we all struggle but we just get on with it.
You will have to sacrifice lots of things which mostly includes spending money.
I understand about the benefits, but do claim what your are entitled to (family tax credits etc) dont be ashamed for claiming them, they are there for and your baby so take advantage, you will need it!