my baby is 6 weeks old as of yesterday and for the last few days she has been a bit constipated. on two occasions when i changed her diaper her poo was pale yellow. i looked it up and it says that could be a liver problem?

i changed her diaper another time and it was a regular dark yellow/orange color like usual. she doesn't have jaundice. should i call her ped now or wait and see how it progresses? i was told not to be concerned unless she has jaundice but i just want to be sure