EPing to nursing help!

kk

So ive been exlusively pumping since my baby was born six days ago. We finally are having success with nursing with a nipple shield, yay! I have a good supply and ive been pumping every 2 hours. Now baby sometimes eats every 30 minutes or he will go 3.5 hours so we arent exactly on the same schedule. Also he's past his birth weight so im not worried about his sleeping patterns. My question is, how often should i pump now? I dont want to drain my milk before he eats because then he doesnt wanna nurse but i dont want to be engorged either. Should i just pump to relieve engorgement? Or still pump on a schedule? Im not sure how to transition easily and dont want to jeopardize my supply. Help please and thanks in advance!