I've had digestive issues/IBS since I can remember. The color of your stool is almost always associated with what you ate. There are exceptions, but in this case I don't think there's any cause for alarm at all. If it occurs frequently you should see a doctor. If there is pain associated with your gall bladder, liver, etc. then you should see your doctor. In absence of these factors, I really wouldn't worry. Anxiety can cause all sorts of weird and often unpleasant gastric issues. Various medications can also cause this. If you just can't stop worrying about it, ask your doctor to do a stool analysis to rule out any potential problems, but to help you in the meanwhile you should know that there is nothing urgently wrong no matter what the results may be. In other words, you are not dying. If you were, you'd have other, much more pressing symptoms than just pale stools.