LOST INSTRUMENT TRACKS - HELP!

I don’t know how I have done this (apart from carelessness) but I have lost a song I have been working on for over a month with multi instrument tacks and audio vocals and guitar ( my first on C7.5). I played the song to my base player but we then went on to start recording a new song. When I looked for the previous later it had disappeared, I’m 99% certain I didn’t delete it - at least not intentionally, after searching through all my other songs I have found the audio parts on the pool of a different song altogether but no sign of the instrument tracks anywhere. If anyone can assist I would be enormously grateful!
Jimstokey.