Weird popping, just started

• C✨

Pain is inevitable, this is baby #2 for me. but for the last few hours my lower back started hurting bad, I’ve tried everything, even my birthing ball & it’s not helping. Everytime I sort of move my hips (or while sitting, kinda like pushing your butt back) something in my lower back pops. Which hurts too. what should I do?

18 days left btw.