deleted all my worlds

When I updated to 1.13.04, the next morning I found all my Minecraft worlds deleted and I dont know what else could've caused it apart from updating to the new beta version. I am stressing out because I had a good few worlds created and nothing I've done so far (I searched my problem on youtube) has changed or helped to regain my worlds back. I even tried going back to 1.12.0 and my worlds didn't come back