missing implant

Rahmah
Hello! Has anyone ever had implant fitted and went missing almost immediately? A month back i had implant fitted and the next day it went missing. I couldn't feel it in my arm anymore. So my GP ask i do an Xray which i did( even a chest Xray) and it wasn't found and now she thinks it might have fallen off. I have a big arm she said it could be the reason. The only way they can if its still there is when i start bleeding which am not because am fully breastfeeding and i don't usually have my period untill i wean mybaby around one year and she is just 4 months and four weeks