I myself am wondering if I should get checked. I am also 22 years old, but have the added "bonus" of being born with Hirschsprung's Disease--medically known as angalostic megacolon or something like that (in English--the last six inches of nerve cells in my intestine connecting to my colon were dead.)
Two nights ago, I thought I was getting my period because of the heavy, dark-red, blood flow, but when I checked "there", it was just brown discharge. So I went further back and sure enough, it was coming out of the south end. I also found what I thought was a stuck thingy that I tried to pull out only to find it went back inside. Since then, my bowel movements have been rather small and painful and my lower abdomen has mild pain as well. Of course, I feel sometimes like I still have to go, but end up having just gas.
I guess I'm just not sure if I'm--as my parents would say--overreacting or, considering my medical history, if I really should be concerned.