Does anyone else's uterus twitch??

Kimberly • Mom since 2011. Preemie mom since 2015. Married. I love my lil family
I can't remember if I had this issue before getting pregnant with my son 4 years ago, but I know ever since having him my uterus twitches. It's really weird- happens any time of my cycle, not just when im on my period. It doesn't hurt, just startles me! But it's been 3 1/4 years since I've had my son & it continues to happen. Anyone else experience this???!