Bloody stools should always be looked into. Usually bright red blood indicates some sort of pathology in the lower part of the digestive tract, and internal hemorrhoids are a common cause (you wouldn't be able to see these, since they are thrombosed veins inside your rectum), but it would be good to get a fecal occult blood test to ensure that this is actually blood (instead of something you ate that your body is processing, like red Kool-Aid or the tomato sauce from your spaghetti or something) and then either a flexible sigmoidoscopy or colonoscopy to rule out colorectal abnormalities.
Do you have a family physician/internist that you see? I would suggest an appointment ASAP. The causes of bleeding could be relatively benign, but should always be looked into. Please let us know how it turns out :)
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