dark stools always doesnt indicate blood but to rule out any bleeding you should do fecal occult blood, stool D/R, and check your blood for hb.
if its blood then probably from an ulcer from your stomache if not then its pepto
hi, dark stools indicate internal bleeding of some sort, could be an ulcer or diverticular and yes the pepto should be out of your system, eat plenty of fresh friut and vegies, cheers.