Weird popping feeling in belly

So it has happened three times in the last week where I have moved sideways while sitting to reach for something, or sat up from laying on my back and felt a giant popping sensation in my right Sid eof my abdomen.

The best way I can describe it is if a popcorn kernel popped in my belly.

I'm 16wks..

It didn't hurt.. But it was a very big popping feeling..

I work in labour and delivery and not one person I work with can tell me what the hell this is?!

Has anyone else felt this?

So strange.