Is it possible to "move things around" during sex? & is it concerning?

Hi guys, this may be kinda tmi but I'm curious if others have experienced the same. My boyfriend asked if ive wondered why we stopped having sex with my legs over his shoulders.. and he tells me its because he could sometimes "feel things moving around" ? He felt like he may have went "too deep" because things physically felt different as well. The way he talked about it made it seem like it was really noticeable. I was recently told I had ovarian cysts and hes wondering if its this or something more concerning. Thanks!