Soph -
thanks for your reply and information. I am just about to update the chart because the OPK test line only had a minor dark outline, definately not half darker - so, FF adjusts O day to CD66....anyway - I am actually looking forward to getting AF now (believe it or not) because at least that might help confirm 'O'....

I really hate this - I was actually most confused when I got a clear ultrasound the other day - now I am left wondering what other mystery problem I have given the looooooooooooooong cycle....