Related terms:
abstain
infertile
avoid pregnancy
unprotected
infertile phase
ovulation
pregnancy rates
cervical mucus
failure rate
periodic abstinence
fertility awareness
periodic
family planning
cervical
birth control
fertility
per year
breastfeeding
natural family planning
reproductive
pregnancy
catholic church
cycle
catholic
Wikipedia sources:
Natural family planning
Calendar-based methods
Fertility awareness
Context for words:
nfp
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