Day 5 is this normal?

I've EBF my baby since birth, no bottles or binky's, well today my breast dont feel as engorged or full. I use a haakka on both sides while baby sleeps and it totals 4oz both last night and earlier today which I have been putting in baggies and freezing for later on. My question is- is it normal for my breast to feel softer at only 5 days? I feed on demand usually every 2hrs. Does this mean I may be producing less milk? Should I be worried?