I'm 27 n not pregnant n have taken numerous pregnant test n there all negative but I continously have fluttering feelings in my stomach, what could it be?

Bowel motion. Your intestines are constantly in motion. Some people can feel that intestinal activity. That is likely what you are feeling.
See your doctor. Can't tell here. Fluttering in the stomach (abdomen?) can be due to lots of causes, including gas, intestinal spasm, blood vessel problems. Doubtful it is gyn related; apparently not pregnancy related. See your doc.