Provisional Ballot Question

I received my ballot a few weeks ago and filled it out this past week but later realized I marked the incorrect option for 435. I have not submitted my ballot and still have it in its envelope.

Since I have not turned in my ballot, would it be possible to receive a provisional ballot in its place and vote in person on Monday or Tuesday? I haven't been able to find information regarding this exact issue online, and my county's (Douglas) election office is closed until Monday.

And if I were to go on Monday, does anyone have advice regarding how early to get to the election commission in Douglas County on Monday morning?

UPDATE: I went to the Douglas County Election Commission this afternoon with my original ballot. They voided it and gave me a new one that I will be able to fill out at home and submit to a ballot drop box before the deadline tomorrow. I would have been able to obtain a provisional ballot at my polling place tomorrow, but I'm happy to be able to fill it out at home instead. I got in and out in 10-15 minutes, as they only make you wait in the long line if you did not receive a mail-in ballot but want to vote early.