Blood in poop?? Help!

Before I start being a worry-wart, I want to show you ladies these pictures in case any of you are experienced mamas and know about this.

My baby is 4 months old, exclusively breastfed, and has no health concerns. She’s starting to teethe, and has acted normal all day, still is acting normal.

I changed her diaper after a big poop, it looked pretty normal, a little watery but I haven’t put her on cereals or foods yet so maybe that’s why, or because I drank a lil extra coffee today because... well that’s self explanatory.🤷🏻‍♀️

Anywhoo, when I put the brand new diaper on her, she farted and a little poop came out again. I noticed a hint of blood in her stool (shown in pics).

Any experiences with this? Ideas of what it may be from?