Usually if the SD card gets dislodged while recording you can/will lose the last chapter recorded because the video recording is not properly closed, but not everything on the card. It doesn't really make sense how the data could get erased as it wasn't even in the camera once it got dislodged. Very weird. There are recovery programs out there that you can try, but many are scams that don't work or will install malware. Your best bet is to check with the manufacturer of your SD card directly and see what they recommend. Best of luck.
