There is no difference in the peak on CB vs peak on the strips. They are measuring the level of LH in your urine. That's all.

I do not keep that kind of data firstly because it's just not possible to keep data on everything, but secondly because timing has been 100% debunked in about 20 different ways and so I see no purpose in keeping data on the vagaries of timing. I promise tons of people have gotten girls with one attempt and CB since CB is the most popular kind of OPK by far.

No one knows whether to believe the strips or the CB. The strips come in all dfferent sensitivities, some are more sensitive than the CB, others are less. Additionally, it is likely that the patterns are different for every person in every month anyway and they vary dramatically I have you guys go off the first positive of any brand, because while you can get pregnant from an attempt that is earlier than optimal, you can't get pregnant from an attempt that's too late, so waiting around for a test to go positive is not something I recommend. OPK can give false negatives, so the first pos may have been real, and then the second never goes positive and you miss your attempt totally if you wait.