I'm feeling this fluttering feeling on the lower side of my belly. I am not pregnant as I took a test and it came out negative. I have irregular periods. I came on last month for the first time in 2 years! I came on again this month. The 1st week was slotting and the 2nd week was normal. I also mos carried twice. Can anyone please tell me what it could be?!?!?!?