Help!! I'm am so stressed out

I just found out that since I hadn't been at my job for 1 year, that the company I work for won't cover my maternity leave at 100%. Instead it only covers 50%. I'm grateful to be getting paid anything but that's cutting my check in half for possibly almost 2 months. It's difficult because I have a 8 year old already, a little one on the way, rent and other bills...I'm a single parent. I haven't heard from the dad in months...I don't know what to do at this point. I'm due at the end of next month and this has completely stressed me out