Autosave is not active until you manually save your Pages document with a proper filename. Thereafter, autosave is automatic for this document, and occurs about every 10 seconds (locally) when there is a document change, and somewhat longer if the Pages document is located on iCloud Drive.
On my Mac, I have Time Machine configured and every hour, it backs up anything that changed since its previous backup. That is your best chance to recover a changed document from an hour ago, if the File menu : Revert To : Previous Save…, or Browse All Versions are insufficient in recovering the document.
Outside of a Time Machine Restore of the particular document, or the Revert To sub-menu options, there is no other means to recover your more recent, or lost work.