7 week old not pooping

Erin

My 7 week old hasn't pooped in 3 days. She drinks pumped breast milk only. She went from 6 times a day to none. She doesn't seem to be uncomfortable. She's still drinking 4oz every 3 hours and plenty of wet diapers. Different things on the internet say different things. Some say it's ok and some say go to the doctors. I've already made a call to the pediatrician and waiting for a call back. Seeing if any of you have experienced this. Thanks!