Don't know what HIV6 is.
Duo is a combination test, ( 4th gen)
Quick, sounds like it was a rapid blood test.
( finger prick)
19 days is not conclusive though encouraging being many would have enough detectable p24 antigen by then.
If you actually used a latex condom and it didn't break, you had no risk for hiv.
Being you are unsure, a 4th generation test is considered conclusive at 6 weeks by many experts and health organizations.