Hello, ive been feeling on my left abdomen like muscle spasms or fluttering sensa, under my belly button on the left side. No pain just it hasn't stop?

Likely muscle spasms. It's common for the abdominal muscles to develop spasms. This isn't anything dangerous but it can happen either from being too sedentary or even from excess exercise. I recommend doing some ab crunches and some core exercises. This should help it subside. If it doesn't change after a week contact one of us to discuss in more detail and to figure out the next step.