I have yet to get ppsitove opk and on CD17, but I have jas ewcm and mild crampong the past 2 days. Hubby and I are doing the deed to make sure we don't miss it. But why haven't I had a ppsitobe opk yet when I'm having everything else?

The one fourth up from the bottom was taken on CD15 around 8pm. The one under that was taken CD16 around 7pm (I wasn't able to test that morning). The last two are from today. Could I have missed the poisitve yesterday morning?