I am having fluttering/spasms/bubbles in my lower abdomen. no pain, i am a female and i am certain i am not pregnant. i had blood work and urine testing done and nothing abnormal. what could be the cause of this?

Fluttering, bubbling,gurgling,mild cramps, in my opinion, are more likely to be from some intestinal irritability &peristaltic waves and gas.. You may have associated softer stools. Are you eating more roughage? Can you trace these symptoms to lactose intolerance from diary products? See your MD or a gastroenterologist if symptoms become exaggerated.

It could be one of many things but does not sound serious. eat a healthy diet, avoid constipation and foods which can give gas, exercise and you should be OK. If despite this you do not improve pl see a GI MD