If im not pregnant why am I feeling movement in my stomach?

Bowel motility ?? If you notice the movement while you are at rest, it is probably your intestines. Your intestines are constantly in motion, and sometimes you can feel the sensation of movement inside your abdomen just because of the normal bowel activity. If you are feeling the movement only when you change position, it could indicate a mass in your abdomen or pelvis - in that case you should see your doctor.
Bowel gas? Bowel gas and even stool movement in very active intestinal tract can be felt. I have encountered a number of patients with pseudocyesis, a physiologic set of symptoms like pregnancy without an actual pregnancy. Many are convinced of movement and even signs of labor. Often a trained counselor is necc. To work past this , with the hope of a real pregnancy.