Thanks for your response ladies.

I have done some research and here are mine findings:

O is generally considered to occur at the beginning of the temp rise, usually the lowest reading on the graph because temp drops just before O by about 0.12 to 0.3 C. The temp drop is not always seen because it is a 12 hour drop whereas the temp is taken over 24 hours.

Because the temp drop is not always seen, the beginning of the rise is taken as being the most likely day of O but more commonly it occurs before this.

It is reasonably common to O up to 3 days before the rise and also possible to O up to five days before the rise. Even Oing up to 2 days after the rise is possible too!!! O causes the basal temp to rise up to 0.5C.

I think FF is being conservative in putting O day 2 days later being the day after the rise. I am not a freak by getting a temp rise 3 days after 0 day - IT IS COMMON!!!

Now just trying to see how long I can hold out before testing.

TICKLISH