《为ai而绿》第1章
还是有怀孕机率就算带套套还是有10%的机率"," 如果是要算安全期的话，要怎么算呢"," 以28天为例的话!"," |_______|_______|_______|_______|"," 1 ______7_____14______21_____ 28"," |月经期|安全期|危险期|安全期 =>下一次月经"," 也就是说"," 假设1日来mc!"," 大概14日就是排卵日(若以30天算就是第15日)"," 由于精子可以在子宫内存活三天"," 因此排卵日的前三天到后三天都是危险期(也就是第11~17日)"," ...
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