EBF baby not pooping?!?!

Brittany • Mommy to a wonderful 6yr old boy, 2yr old girl and 1yr old girl.
Is this normal? She is 5weeks old. She's never had a drop of formula. My last breastfed baby pooped every time she ate. It's been 2days since she pooped. She's passing gas when we do tummy exercises. It just worries me a bit. I would hate for her to be in pain.