Browse not showing cards in deck

Hi there, I am using Anki 2.1.49 on Windows 10. I had just made a deck and completed all of the cards 2 days ago and today went back to review but none of the cards from the deck are showing up under browse- they seem to be gone completely I can’t find them anywhere. This has never happened before and doesn’t seem to have happened with any of my other decks. I really hope someone can help me to recover the lost cards?

Thanks so much

You may be able to recover your data from an automatic backup. Restoring an Automatic Backup (Recovering from Data Loss) - Frequently Asked Questions