First Response OPKs: no test line!!

Has anyone ever used the first response OPKs? I️ got a positive LH on the opk test strips, but nothing AT ALL on first response. Thank goodness I️ wasn’t using first response only. I’ll just stick to the strips. I️ just wanted to have another opk for confirmation. Btw, ignore the date on the last strip which I️ just did. Initially I️ was only doing 2x a day, but decided to do 3 today, because TTC life lol

Looks like I’ll O a couple days early than what any of the apps I️ use say. All of them say Saturday, but I️ already am feeling the O cramps.

Im goin to keep testing until line goes away to confirm O, since I’m not doing bbt.