Hi,
first contact a Dr. And make an appt. It might be nothing and then again it could be a digestive disorder, such as celiac disease or one of several others. You might have an infection in your lower bowel tract too. The only way to pin it down is to see a colon specialist. They deal in digestive disorders. Keep tract of what you eat, and a temp if running one.
Hope this will help, good luck.
Leslie