How likely is it to test positive 25 days after exposure

[Bells3032]

I have just moved house and obv that has entailed more exposure than I'd like with delivery men, removal men, handymen etc

I need to have a medical procedure in about 26 days and that requires me to have a covid test 48 hours before.

If I have caught it in the last day or so how likely will be it be that I still test positive in 25 days??

Thank you

I think retests aren't allowed within 90 days, so I assume could still test positive up to 90 days later.