Occasional Popping Sensation “Down There”?

Callie • 👶🎀 8.18.18. 👶🎀 3.16.20.

FTM going on 36w, and these past couple of days, I’ve noticed an occasional popping sensation down there... it isn’t accompanied by fluid, but there is a lot of pressure and discomfort, and it seems to happen most often when I’m standing up from a seated position. What is this weird feeling?! Is it normal?