You can vote provisionally in person without your mail-in ballot. This is useful, for example, when the tracking fails to show your mailed ballot being counted. Explain your situation at the polling place, and they'll set you up with a ballot. That way you won't be flagged for attempting to vote twice fraudulently. The election board will sort it out.

https://www.vote.pa.gov/Voting-in-PA/Pages/Voting-by-Provisional-Ballot.aspx