Billings Ovulation Method Of Birth Control
How It Works The Billings ovulation method is based on your close assessment of your cervical mucus. Generally speaking, over the course of each menstrual cycle, cervical mucus changes in predictable ways. Usually, cervical mucus becomes clear and elastic about six days prior to ovulation, due to the influence of estrogen. Ovulation is likely to occur on the last day that cervical mucus has these features. After ovulation, cervical mucus is affected by progesterone and becomes thick, sticky, and opaque....