The Scientific Principles of Fertility Awareness

    • A woman’s menstrual cycle is hormonally controlled by estrogen and progesterone. Estrogen dominates the first part of the cycle in preparing for ovulation, and progesterone the latter part of cycle in preparing for pregnancy.
    • A ripe egg lives a finite period, between 10-24 hours. If a second egg is released in one cycle (i.e. fraternal twins), it will be released within 24 hours of the first egg.
    • Sperm can live in a woman’s fertile, high-quality secretions for 3-5 days.
    • The corpus luteum (the remnant of the follicle after ovulation occurs) releases progesterone, which acts to inhibit further eggs from ovulating until the following cycle. Its lifespan is 12-16 days, approximately two weeks.
    • A healthy woman produces three observable fertility signs that signal impending ovulation or its aftermath: basal body temperature, cervical fluids or secretions, and cervical position.

Back to Controlling Fertility Naturally Without Hormones

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