It feels like something kicking in my stomach but I'm not pregnant?

If you're certain that you're not pregnant, the first thing I considered was "does it really feel like a kick?" I guess that depends on whether or not you've actually been pregnant and had a real "kick" or not.

The kicking sensation you are feeling is simply your intestines moving food and waste through your digestive tract at a higher rate. This is fairly common and should not be concerning unless you experience symptoms that are painful or last for prolonged periods of time. If you are still concerned discuss your symptoms with your doctor.