Has anyone tried dollar store opks?

I have never used dollar store opk but this month I said I was going to take a break and not test seeing we are 7 cycles and I’m needing a mental break from the roller coaster ride “TTC” so didn’t order my usual ic.

Long story short I usually ovulate cd21 and today is CD21 I feeling like I’m ovulating...so out of curiosity I ran to the dollar store and grabbed a test assuming it would show a positive but it didn’t. So my questing is do you ladies find that the dollar store tests always have a test line?? Or faint until positive??

I have used first response and the tests were stark white till I was hours to my peak. So I’m not sure how to feel about what I’m seeing with these ones.