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