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method）以及以尿液荷爾蒙為基礎的方法，也可以將幾種方法一起使用。 基础体温、子宮頸粘液以及子宮頸位置是三種主要的可孕信号（fertility sign）。以症狀為基礎的方法會追蹤一種或是多種可孕信号。只根據子宮頸粘液的方法包括比林斯排卵法（英语：Billings Ovulation
Titia. Use of the novel combined contraceptive vaginal ring NuvaRing for ovulation inhibition. Fertility and Sterility. May 2001, 75 (5): 865–870 [September
The Billings Ovulation Method (PDF). 2005 [2005-11-03]. （原始内容存档 (PDF)于2020-04-05）. Sinha G, Sinha A. A field trial of Billings' ovulation method for
progesterone, though ovulation was inhibited only in some 70% of the cases studied. [...] The mechanism of protection in this method—and probably in that
泌乳停經法(Lactational amenorrhea、lactational amenorrhea method (LAM))也稱為母乳餵養期不孕法，是指在產婦生產後，若完全母乳餵養嬰兒，會有一段閉經的期間，也是一種避孕的方式。在沒有配合其他避孕方式（像保險套、殺精劑、激素避孕藥（英语：Hormonal