[Scotswife]

"CCL, nor no one I am aware of teaches that you wait 3 days after the temperature shift for dry up"

From...Taking Charge of Your Fertility
Toni Weschler, MPH


"3. Temperature Shift Rule
You are safe the evening of the third consecutive day your temperature is above the coverline...." (p. 129)

from the glossary...

"coverline : A line used to help delineate pre- and postovulatory temperatures on a fertility chart."

[klossg]

Thanks for the reply.

Toni Weschler, MPH ... Temperature Shift Rule

The way you have written it, the rule is a temperature only rule. Correct? Maybe she suggests to combine this rule with one involving mucus? I would not trust an NFP system that promotes temperature only with only 3 days. It may not have enough data to prove it works. The only reason I say that is CCL has data back to the 60s that has them teaching a 4 day temp only rule. CCL has a temperature only rule but it is four days of shift, not three. It is four temperatures at least 0.4 Deg. F above the pre-shift six temperatures.

But, CCL does not normally rely just on temp but would cross check the three days of shifted temp with 3 or four days of mucus dry up. The assurance of temp and mucus for phase three transitions makes the Sympto-Thermal system 99% effective.

And unless I have it wrong, which I might well be, you were talking about phase two issues ... 7 days or more before ovulation occurred. And pre-ovulation phase two has nothing to do with temperature shifts, correct?