I've decided that with charting cervical position, I'm going to use the Doering Rule to determine when to start checking this secondary fertility sign. The Doering Rule counts the beginning of the fertile phase as "the day of the earliest previous temperature shift (which for me would be CD17) minus seven." Since for me that would work out to be CD10, that is when I start checking the cervical position, and I continue until after ovulation has been determined. So, tomorrow starts cervical position check -- stay tuned!
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