Honestly it’s a bit of a roll of the dice. Anything you’ve previously received will still be there. As to ads in this period, you can receive IF they happened to already be reconciled and/or reported on the backend. Unfortunately this is done randomly and we wouldn’t be able to tell you what would have been reconciled or what you may have lost.
Short version is you may have lost some or all of your earnings prior to you resetting your PC. We have no way of knowing until you receive your payout.
Btw, I might suggest checking out my FAQ that Brave pinned a while back. It goes into detail on various topics, including what to do and risks if you’re trying to do a backup or reset your PC. You can see it at -Retired- PSA: User FAQ - Support & Answers