How to be stay at home mom

I have a 1.5 year old daughter and 6 weeks pregnant with my second. Im doing early morning side work waking up at 3:30am there until 8:30am. It is slowly killing me. It gives me about $170-$200 a week. My daughter still gets up through out the night. Im am constantly tired and it ruins my whole day. My husband makes pretty good money. I am going to need a car that can fit carseat. Groceries are expensive and of course we like expensive stuff 🙄. How do we cut costs so I can stay home. This momma is over it 😩. TIA!!