Poop Concerns

Hey moms, we just had our first baby, she'll be 2 weeks old tomorrow (where does the time go??). I pump and supplement with formula, so she eats from a bottle, usually about 2.5oz breast milk and .5oz formula. Her diapers have all been looking about the same until today, it looks like she has diarrhea. She doesn't have a fever and hasn't been throwing up, could it be something I ate?