Is it normal to not feel “full” between feedings?

My son is 3 weeks old and we are EBF until I return to work (or close to it). I think he’s going through a growth spurt because he is wanting to eat every 2ish hours and spends about 15-20 mins nursing per side every feed. He was wanting to nurse every 2.5-3 hours and only nursing from one breast per feed until yesterday when it picked up.

I just worry he’s not getting enough and that’s why his feeding has picked up. I don’t have a “full” feeling anymore during the day. I only ever feel it when he wakes up to eat at night because he’ll sleep about 4 hours between feeds at night.

Is this normal?