- normal family members preparation where ovulation is thought to happen fortnight ahead of the start of an interval (the fertile period will be believed to give from time 10 through time 18 of her cycle)
- normal household planning in which ovulation is presumed to happen fortnight prior to the start of an interval (the fertile duration could be assumed to increase from time 10 through day 18 of her pattern)
Hypernym for "calendar method of birth control"
- natural family planning
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