Family planning, natural means: A sperm can live for as long as 7 days in the female’s reproductive system, and an egg may remain fertile for approximately 24 hours. This means that a woman could get pregnant within a significant window — 7 days prior to ovulation or 3 days thereafter. The menstrual cycle and changes in cervical mucus or body temperature are all used to determine when a woman becomes fertile. This form of birth control will be the most common for women to fall pregnant unintentionally.
(in Medical Dictionary)
What else does Family planning, natural mean?
Natural family planning: Also called fertility awareness, periodic abstinence, and the rhythm approach, this method entails not having sexual interaction on days when a woman is most likely get pregnant, or using a barrier such as the condom, diaphragm, or cervical cap to birth control those days.
(in Medical Dictionary)
