Well, now you will know Jack
OK, first don't panic. Have you looked at the stool to see if there is blood in there? If there is no signs of blood that you can see IN the stool, then it's probably your anus stetching when you do #2. However, if you DO see blood IN the stool, then that is a sign that something serious maybe happening inside you, like intestinal bleeding or colon cancer. Anytime you see blood in your stool, it is a sign of trouble, and you need to see your doctor for further diagnosis. Otherwise, I wouldn't worry about it too much unless it happens on a regular basis. I've had this from time to time myself...few and far between.