Is my milk drying up?

A
My baby is mostly formula fed but I was managing to pump about 5oz of breast milk per day to give to him. 
I decided to stop pumping and haven't pumped for about a week. 
I thought my milk had dried up but when my baby cried today I had a lot of milk leak and it made me decide to pump again. 
I'm only getting about half an ounce per session. 
Is it possible to get my supply back to the way it was before if I pump every few hours again? 
I'm 3 weeks and 4 days postpartum.
Thanks for any info you may have 🌸