Stay at home mom

So it is decided that I'm going to be a stay at home mom. I'm working up until I'm about 37 weeks and then I'll be done. I'm sad that I will be leaving work; I'm a nanny and love the kids I work with. I'm nervous because SO makes about 30,000 a year and scared that's not going to be enough. I wish to return to work when my child is old enough for day care/school. Anyone else in the same boat. How are you/ plan to get by.