Clear blue advanced and cheap opks

Hi all wondering if anyone has any insight

I normally use the cheaper opks from fertility friend majority of my testing period each cycle and use the clear blue advanced to kind of confirm that really.

However on the 20th of May I got my peak solid smiley on clear blue but negative on cheap opk. I have now tested with the cheap opks at different times throughout the last 2 days (it’s now the morning of the 22nd) and still negatives.

The sharp twinges and back pain have gone so I think I have ovulated. Maybe I missed the actual peak the cheap opks pick up. Maybe it was a really quick ovulation.

As I tested with clear blue at 6am and it was flashy smiley and then at 1pm it was solid.

Do I keep testing with cheap ones ?

Thanks