Have you tried clicking edit then undo?
The recovery in pages is not too user friendly, but once you understand how it works, then you can always go back to this.
You may also want to consider an online service such as dropbox.com as this does versioning for you as a second backup to this (pages is not always reliable for creating a version)
If you would like any additional information or assistance, please do not hesitate to let me know.
And please take a second to rate my service by clicking one of the stars at the top of the screen then submit