Very long IUD strings yesterday now I cant find them. Anyone else have this?

I've been monitoring my string since april 21 last week and I barely had to check them as they sat right near the opening of my vagina. I thought that was strange as my OB cut them really short near my cervix in september. Last night I checked and they were still in the same spot and cervix was positioned in the same spot, this morning my cervix is SO far back I can hardly touch it to tell if my strings are still there and I've felt anywhere i possibly could and no strings 😅 has this happened to anyone else? Going to try later, just hoping my IUD didnt fall out but I doubt It