“排卵期征象法”是一种自然调节生育的方法,由澳洲医生John和Evelyn Billings等研究发展而成,故又称Billigs方法。一般正常月经周期中,在月经期后有一个阴部“干燥期”,随之出现“湿润期”,其后又是“干燥期”和下次的月经期。所谓“湿润期”是指溢自阴道的宫颈粘液所产生的阴部湿润感,其性状会随不同阶段的激素水平而变化。当雌激素水平较低的月经期前后,粘液常稠厚而量少,提示不易受孕。在周期的中期,当雌激素水平逐步升高时,粘液也随之越来越薄,量亦越来越多,越接近排卵期越变得清亮,滑润而富弹性,直至“高峰日(即排卵前一天或当天),其清澈度如同生蛋清状,拉丝度亦最 “Ovulation signs method” is a natural method of birth control, developed by the Australian doctors John and Evelyn Billings and other research, it is also known as the Billigs method. Normal normal menstrual cycle, after the menstrual period there is a genitals “dry period”, followed by “wet period”, followed by “dry period” and the next menstrual period. The so-called “wet period” refers to vaginal cervical mucus overflow vaginal moist feeling, its traits with different stages of hormone levels and changes. When the lower estrogen levels before and after menstruation, mucus often thick and less, suggesting that difficult to conceive. In the middle of the cycle, when the estrogen level gradually increases, the mucus will also become thinner and thinner, the amount is also more and more close to the more ovulation become clear, smooth and flexible, until the "peak day Ovulation day or day), its clarity as raw egg white, drawing the most degree