My milks drying up :-(

Brittany • Mommy to a wonderful 12yr old boy, 9yr old boy 7yr old girl 6yr old girl and 3yr old girl. Due March 11th 2023 with a boy.
I was getting 5-6ozs out of my left Breast and now I'm only getting 1-1.5ozs and I was getting 3-4ozs out of my right and now I'm only getting 1oz. It's not even enough to make her a bottle 😔 shes 4weeks so it's not like I'm just starting out. I'm so bummed.