Pumping

Hey ladies! So my little one is 3 weeks old she spent the first 11 days in NICU. So since she wasn’t feeding at first they had me pumping every 3 hours so they could feed her via NG and then eventually in the bottle/breast. So I was pumping huge amounts out like 120- 180 ml or 4-6 ounces out per pumping session every 3-4 hours. Once she got home I cut back on the pumping and did more breastfeeding and now she breast feeds like a champ and I haven’t been pumping. Anyways we’ve been trying to give her a bottle a day so dad can feed and give me a break and also so that she doesn’t forget how to use the bottle so we can go out every once in a while. Anyways today I decided to pump for the first time and like a week and I only pumped out like 2 ounces total. Now I’m all freaked out I’m loosing my milk supply. Baby is gaining weight and lots of poops and pees but is it normal for the amount I pump out to drop by so much?