Warning pic included but black tarry stuff in baby poop

My baby turned 3 months old on December 1st the next morning woke up and she was projectile vomiting, no fever tho, and after she vomited she acted completely fine, now I’ve noticed black tarry streaks in her poop, she always acts like her stomach bothers her she’ll pull her legs to her stomach and sometimes cry. She’s formula fed with some breastmilk when I can pump enough, but I was just wondering if this is normal or has anyone else experienced it?