Related terms:
nfp
billings
cycle
infertile
ovulation
cervical
per year
method
unprotected
fertility
rhythm method
failure rate
pregnancy
avoid pregnancy
infertile phase
barrier methods
contraception
birth control
catholic
breastfeeding
achieve pregnancy
fertility awareness
natural family planning
roman catholic
Wikipedia sources:
Natural family planning
Fertility awareness
Calendar-based methods
Comparison of birth control methods
Context for words:
periodic
abstinence
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