Weird flutter like kicks in tummy but not pregnant?

I've been experiencing these weird flutter like kicks in my belly. It's the lower, middle, and upper abdomen (almost under my ribs) where this sensation happens. It kind of feels like when the back of your leg muscle twitches or maybe your calf except it's in my belly.

It's kind of freaking me out though. I had a negative blood test but I'm like ummm wtf is this? The last time I had unprotected sex was the first week of May. I've had periods and stuff since then but just kind of wondering what this is?

It only happens for like one second and it comes maybe 3-4 times a day. No pattern