I think I figured it out! Pos OPK in late morning neg in afteroon - anyone else?

Hi Girls!

I think I figured it out. I know your body makes LH in the morning when ovulating or not and I had been testing at around 11am and been getting positives for the last 4 days but the last two days when I test in the arvo they are neg again.

Does anyone else have this problem?

I have put the last 2 days as neg on FF as if they were true positives I would be positive all day and it has put my ov day as CD16 which sounds right as that is the day with most EWCM.

Any advie would be great!