Week old hasn’t pooped in 2 days

Ba

We were supplementing formula and we’ve been trying to come off the formula and only nurse/pump. She pooped at about 4 am yesterday morning and hasn’t since. I called the doctor and she said it was normal for breast babies, but I can’t help be worried... she is peeing still though! We’ve had probably 5 or 6 wet diapers today but no dirty. Anybody have the same experience? She is tooting a bunch but won’t really burp! Advice please