Breast engorgement

Hi mommies, I gave birth 9 days ago and DL my bb since day 1. My breast gets v hard and firm quickly despite being on a 2-3hr feeding schedule as he has jaundice. I’ll use a haakaa or hand express(breasts feels a bit sore after, idk if I’m overdoing it😕) if I still feel slightly full after feeding but idk how to tell if it’s completely empty?? Idk how soft the breast should be. Is it normal to be engorged so quickly despite being on a 2-3hr feed or is it a early wks pp thing that will go away? #advicepls