Easy, if regular...: If a woman's cycles are regular, on her calendar she will see that the number of days from her September period to her October period was the same as from October to November. She can count the same number of days from November 22 into December and arrive at her predicted December period date. However, if her cycles are NOT regular, then all bets are off (hard to guess her December period date).
Answered 12/17/2019
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