Baby hasnt pooped in 24 hrs... I'm worried. She's 3 days old. i havent seen a wet diaper either in…

Baby hasnt pooped in 24 hrs... I'm worried. She's 3 days old. i havent seen a wet diaper either in about 9 hrs but i think she has peed and it was just absorbed. im breastfeeding exclusively and shes eating and latching just fine. every 2 to 3 hours she eats. it's this ok? we have an apt first thing tomorrow