Pumping

I am 3 weeks 2 days postpartum, I have decided with a lactation consultant to Exclusively pump/bottle feed instead of breastfeeding as it wasn’t working for us.

I am pumping every 3-4 hours and only getting a little under 3oz off each breast (total of 6oz) each pumping session. Is this normal?

I should note.. I was extremely extremely engorged to the point I couldn’t even talk I was in so much pain and was told to drink a ton of peppermint tea .. I just read that it actually decreases milk supply and now I am freaking out. 😥