Was your vote actually counted? Ballots can be challenged if there was no signature on the back of the return envelope or if the signature does not match the one on record at Clackamas County Elections. Check if your ballot is on the list of challenged ballots. (“No records found” means you’re not on the challenged list.)
If your name is on the list, you should have got a letter from the County Elections office. You can contact the county elections office on (503) 655-8510 or go pay a visit to them at 1710 S Red Soils Ct in Oregon City.
This needs to be done before Tuesday at 5 pm, when all the votes are finalized.