A pain in my butt.. Literally.

Starr • Baby #3 Coming Soon! Selenya Avery born July 2016! 🎀 Angel Baby Lily🌸👼🏼 Secilia Elizabeth born October 2021 🌈💖 Maverick due May 2025 💙
I'm 26 weeks 4 days and the past few days I have been having this odd pain and pressure In what seems to be my butt. When I tighten those muscles it worsens. It's especially uncomfortable when sitting down. Any idea what this could be? Or am I alone on this one and it's really just my SO being the pain in the butt 😉