为了使用观测宫颈粘液避孕法和安全期避孕法，我应该了解的关于生育周期的知识

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女性每月只有一个卵子成熟排出。

成熟的卵子大概在下次月经开始前14天从卵巢排出。

卵子排出后大概能存活24小时（一天一夜）。

男性的精子在女性体内存活期可以长达两天。


Sources
  • Burns, A. A., Niemann, S., Lovich, R., Maxwell, J., & Shapiro, K. (2014). Where women have no doctor: A health guide for women. Hesperian Foundation.
  • Audiopedia ID: zh020506
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