Abdomen twitches 5 months postpartum

This past month I’ve been getting these twitches in my stomach, they literally kinda feel like baby kicks. So much so that I actually took a few pregnancy tests lol obviously they’re negative. I’ve been taking them now and then anyway since starting to be sexually active again with hubby a few months ago and we’re open to having another. But yeah, all tests negative.

Are these muscle twitches from my abs strengthening again, or nerve endings or something? Just wondering if other mamas have felt this postpartum.

Thanks!