If it is bright red blood it could just be from straining when you were constipated or irritation if you went to the bathroom more often. Especially if it was red blood when you wiped, it is likely it's from that. If it was on your stool, it could still be from that. What you should be worried about is if it was dark blood (black or deep brown) or if your stools are black, as this means bleeding higher up in the digestive system. Most likely it is just an anal fissure from straining, but if you are worried do go see your doctor.