Go back to work three weeks after birth

I need to go back to work ASAP after giving birth I’m scared about what I’m going to do to pay bills as I’m a single mom doing it with zero help I have no family no friends to hell and I make way more money than my baby dad he only works three hours a week.i budgeted and I can only save 50$ every two weeks which will leave me with 600$ for baby when they come and when that runs out I will have to pay for everything out of pocket.im super stressed out how do single moms pay bills when they want to be home with baby?right now it looks like they will have to be in daycare at 4 weeks old(and 4 weeks is the age my state allows infant rooms to take babies)