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安全期避孕的“前七后八”理论

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“前七后八”是安全期避孕中常见推算安全期的一种方式,但是一些女性因为对“前七后八”错误的理解而导致避孕失败。安全期,顾名思义,多数的人都会认为在这个时间段根本就不用太在意避孕。其实这是非常错误的,一起看看专家是怎么说的吧!前七: 这个很好理解,就是来月经前的七天,这时为相对比较安全的后安全期,这个基本上没有人会理解错误。后八: 是指从来月经来潮的第一天开始算起之后的八天,不是月经结束后开始算起。假如某个女性从12月01日开始来月经,12月06日结束,那么“后八”是指12月01日-12月08日的八天,而不是从月经结束以后开始起算的12月07日-12月14日这八天。其实这位女性排除了来月经的几天,真正属于前安全期的其实只有12月07和08两天。如果女性的月经周期少于26天,一般来说,仍然可以推算“前七”为安全期,而“后八”则不适用。安全期避孕因为受到情绪、气候、环境等因素的影响,可能出现排卵提前、推后甚至额外排卵,因此安全期避孕显得不那么绝对安全,因此不建议广大女性单独使用安全期避孕。


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