@Sara I am not on any iron supplement
There’s a lot of iron on spinach so it makes sense as iron turns your poo black
I did also have a smoothie yesterday that had beetroot
Most likely the combination of spinach and beetroot. Perhaps lay off the smoothies for a few days and if it returns to normal color then you know it’s that. I also got black poos from taking activated charcoal but I don’t think it’s recommended to take that when pregnant
Are you on an iron supplement as well? That can make your poo dark/black