Negative LH, + Clear blue Smiley 😊 for ovulation?

MissBeam

Hello Ladies!

This is my second cycle with Letrozole (been dosed up to 5 mg this time), the positive smiley is from CD 16 and LH tests show from CD 14-18. I don’t think I ovulated yet per LH tests. However, I never had the first line darker on these LH tests during the past 2 years TTC.

Please let me know if it’s a false positive, or should I trust clear blue than the LH, or switch to another brand for ovulation tests.