Baby has unusual poop colour

Update: His doctor is off till Wednesday and I didn't know what to do so I live in Canada and we have online doctors due to covid. I spoke to a pediatrician and she said to only be concerned if it happens again. This morning his poop was his usual greenish yellow mustard colour. But I'm relieved for now. Hopefully this doesn't happen again!! Got me sooo worried.

BTW THANK YOU GUYS SO MUCH ☺️

Okay so I don't know if u see whitish grey too. But this is the first time he's had this. Is this weird? What do I do??