light pink blood in baby's stool?

Clarissa • Mama
She's 7weeks. She's not acting in pain at all- happier than usual actually.
It was slightly diarrhea.
She does not eat cow's milk (for about 1 month) and is formula fed.
There's no rash or signs of fissure.
Any suggestions? I will call her dr but I likely won't hear back until tomorrow.