Help! Preemie breastfeeding!

First, my son was born full term and I breastfed til 3 months. never had issues, never pumped and exclusively breastfed. He was always 80-90 percentile so obviously my milk supply was good😂 Fast forward to 15 month later when I had my daughter. She is a former 32 weeker and is being discharged tomorrow! At the hospital she was on a thickened formula bc she was having trouble with the thin breastmilk. However it's been weeks now, and I exclusively breastfed yesterday and she did awesome. She said she matured and could probably handle it now. So to just breastfeed, then offer a bottle after to make sure she's getting enough. She consistly eats 2oz every 3-4 hrs right now. I'm only pumping 2oz on my left and 1oz on my right every 3-4 hrs. I think once I'm feeding instead of pumping, maybe it will up my supply. I'm just worried she won't get as much as the pump and I'll have to supplement. My goal would be to have her only exclusively breastfeed. Anyone been through this?