I hope this makes you feel better but I have had red stools in the past and it freaked me out. I went to the doctor and he told me it was just flared up hemorrhoids, this is incredibly common, most of the people you know have or will probably get this at least once in their life and it does indeed cause red stools. Get checked out by a doctor which I know is nerve racking and if it is hemmoroids he will give you some cream medicine which should fix it within a week. I hate going to the doctor cause it rises my anxiety to the roof but I always leave with a sigh of relief and it has made me a little stronger each time I go in and he reassured me of my health.