Super Late O!

So for those of you that were following, i posted a few days ago showing a +opk i got when i was 7 days "late" i wasn't sure if i was O'ing or if i was having a surge right before my AF.. However i did have LOADS of EWCM so i figured i may of been O'ing.. I tested CD 28 and my test line was darker than the control line. CD 29 they were both the same color && today CD 30 my opk is negative.. So I'm almost positive I was O'ing.. I just thought (according to PP) i O'd wayy earlier.. But i never got a +opk or ewcm during that time. So if that's the case I was never late. Im just having a super long cycle ??