The Billings ovulation method is a method in which women use their vaginal mucus to determine their fertility. It does not rely on the presence of ovulation, rather it identifies patterns of potential fertility and obvious infertility within the cycle, whatever its length. Effectiveness, however, is not very clear. Evidence of effectiveness is not very clear. Typical use of this method is associated with a pregnancy rate of 1 to 22%. A World Health Organization study found that 15% is caused by a conscious departure from method rules. The percentage of people who stop using the method after a year is 1–24%. Perfect use has been estimated to result in pregnancy in 0.5–3%. Some studies of perfect use excluded those who could not detect secretions that represented fertility. More information...
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