My map is missing

I was working on my project for a while but I had to stop working on it like 3 weeks. After 3 weeks when I opened the project I was at “Untitled” map. My main map was not in content folder , I searched the map on "Project settings " as game default map but it was not there too.Finally I checked the map on content folder and it was missing there too.My map is dissapeared magically. Is there any way to make it come back? Also I checked Saved folder too and it was not there too.