Breastfeeding Question

Hi I was just wondering how can I tell if my baby is getting enough milk ? She’s 2 months old she nurses every 2-3 hours but for a short time 5-10 mins max. Last time they checked her weight was about 1 month ago so I’m not sure how much she weights now. I’m just worried I might not be producing enough milk for her , I sometimes pump but the most I pump is 2-3oz combined. She also does 6-8hrs night stretches which just seems too much should I be waking her up to feed?