Breastfeeding question

My little one is 5 weeks old and tonight I hadn’t fed her in at least an hour and 30 min but was only able to pump

Half an ounce on each breast. Is that normal? I usually pull at least a total of 3 and a half combined. The past 3 days I’ve been really sick and not able to nurse as often because I’ve been sleeping and my husband as Been taking care of the kids and giving her formula while I’m sleeping (I’d nurse a total of like 4/5 times a day) could that have dried up my supply that fast? How do I get it back up