I was coming here to post the exact same question!
Today I am on CD18 and I normally O on CD17. OPK was positive for CD17, and my O-scope had been showing partial ferning for several days (CD14 and 15) and full ferning on CD16 and CD17.
Yet my temps have not changed AT ALL from my normal temps -- in fact, they've gone DOWN a few degrees.
Normally when I O there is some cramping and I feel like I'm PMSing from O until AF arrives (which sucks), but not this month. Nothing out of the ordinary, sympton-wise.
We've been BDing like bunny rabbits so I can't really get an accurate read on my CM, if you know what I mean.
I don't really understand it myself -- how can 2 of 3 major indicators be so "on", except for the MAJOR one??? I don't think I O'd already, due to the other body symptoms (for me), plus my temps have been fairly steady so far.
Sigh. Just when I think there's a month where all is going well re: TTC then something else comes along to throw a wrench into it! Sheesh.
Glad to know it's not just me, ParsannaS!