The fourth cycle post-pill: This cycle demonstrates the importance of using the extended coverline
to identify the temperature shift.
There is a possible temperature shift on day 14 at the time when a shift might have been expected,
but although there are six low temperatures the shift is minimal.
The true temperature shift confirming ovulation occurs on day 23.
The high temperatures are a minimum 0.2 °C above the coverline which can be extended backwards over
all the low phase temperatures excluding the first four days of the cycle.
Source :- Third Edition of "Fertility" Elizabeth Clubb & Jane Knight, David & Charles - 1996
This chart is taken from a series of charts kept by a woman aged 28 years after ceasing to take
the combined hormonal contraceptive pill.
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