What color is your pumped milk, and how do you know if something is wrong with it?

Tuesday I was super engorged when I pumped and I am now looking at that milk in the fridge and it looks very separated--practically clear on the bottom, milky in the middle and cream on top. Usually it just looks kind of yellow-white with the cream on the top. Did I eat something weird? I'm going to throw it away anyway since we're going out of town today and it's already 3 days old, but.... what's wrong with my milk?

What color is your pumped milk? Does it ever change color or transparency?