答：理论上在怀孕后1周左右就应该可以监测到激素水平的怀孕何变化，但如果这次月经没有按时来，最早再进行检测更加准确。怀孕何 一般在性交后24小时内可以服避孕药补救，最早超过24小时就没有太大意义了。怀孕何如果确实怀孕了，最早有药物流产的怀孕何方法，但自己盲目服用有危险，最早最好去医院在医生指导下进行。怀孕何
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