Breastfeeding child’s poop..

I’m a first time mother. A bit of a worry wart I suppose. My 8 week old is on a antibiotic. It hasn’t seemed to mess with her really, her pediatrician said it may cause diarrhea but we haven’t noticed any. However, her stool went from yellow/seedy.. (breastfed baby poop. To green/ spinach stool. The texture resembles spinach. Sorry for the picture below, anyone who breastfed see this before. I’m a little worried, she isn’t acting differently though and no fever. Thanks for your input.

Edit: she has had her normal yellow/seedy stools mixed with this. The picture just was the most green in her stool.