Reverting changes

My project was a ? block from the Super Mario series, and it was going to be 3D printed. However, I was messing around with Tinkercad's "Align" control, and my project collapsed in on itself. I pressed "undo", but I guess it was too laggy to do so or something, so I decided to reload the page, hoping it didn't save. However, no luck, and I was stuck with an ! block with sides removed.
 Is there any way to revert back to a previous version of a project?


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