I keep having a lot of " fluttering" at the bottom of my stomach. I'm not pregnant & don't have gas, what could it b? Its doin it a lot & just started 2dy

Not sure. "fluttering" can be from many things such as you mentioned. It can be muscular as twitching muscles can act like they are fluttering. Usually you would see the muscles twitching. Also, you have to consider the symptom coming from your heart and referred to your stomach. Since you have had it for two days, and you are concerned, best to get a good history and exam so you can find out! good luck.