Cracking pelvic bone?

I have a cerclage in. It was placed at 23w6d. And before my cerclage I used to get really bad pressure on my lower abdomen and I would get shooting pain in my vagina. It would be so bad that it would hurt to walk or turn in bed. After my cerclage it went away and I felt pretty relieved. I’m 25w4d and it started up again. Yesterday I got out of bed. I sat up in bed and was so uncomfortable because I felt that pressure. I moved my leg and I felt my pelvic bone crack. And It was loud too. I felt really relieved after that because the pressure went away. But my whole vagina felt like it shifted in a new position. Is this normal? I don’t see my doctor for another 3 weeks so I can’t ask til then.