If none was generated you won't get anything.
Lastly, before you depart the Pocket Query page, up at the top there should be a link allowing you to view the proposed PQ (before submitting). You should always have a look-see at that to make sure it actually contains what you want.
Double-check to make sure you have set a day of the week for it to run (this is missed by some, occasionally), not having a day to run = no PQ.
Good luck, and happy caching.
EDIT: context
They have changed it to allow 1000 caches in a query.