Audacity 3.0.2 .au files

Hello. I am a user using Audacity 3.0.2 for recording. Windows 10 user.
I made a mistake and deleted the vocal track, saved that and closed Audacity.
I checked the file size and it did not changed. I think my vocal track is still in the au files but I cannot find it.
Is there anyway to get back my vocal track?

Not unless you have a backup copy.