Clear blue digital ovulation kit

I have been posting that all I see is flashing smiles since cd 10, and currently on cd 20 of a 28 cycle. I called help line and they were beyond helpful. They said their product only detects 40 versus other opk can test as low as 30 for a peak. She stayed that could be a reason for long flashy smiles. She stated  also sometime we have a short surge therefore if you do not test 2x a day you might miss it. I'm like okay, but those kits are expensive! So she is sending me 2 month supply so I'm able to test 2x a day when I'm in high fertile. So there is hope next month IF AF shows up in 8 days... Good luck!