Just a little aside for those doing a search in the future: many things you consume can also turn poop reddish so be sure to think about what you had for dinner if you've just noticed it. For example; beetroot, red wine, berries, stuff with food colouring etc.
In particular what you ate the past sveral days since it takes time to go through (exactly how long depends on your diet and body, but I think 2-3 days is common and a another couple of days is not uncommon). It takes long enough that it is easy to forget.
