有些人因受精卵着床不稳定，轻轻的跌一跤也可能造成流产。
Some people are worn because of oosperm the bed is not stable, gently drop one Jiao causes miscarriage possibly also.
如果是轻微疼痛是正常的，因为受精卵着床会产生此种感觉。
If it is mild pain is normal, because the fertilized egg will produce such bed feeling.
非同卵双生胎是两个受精卵同时在子宫着床的结果。
Non-identical twins are the result of two fertilized eggs implanting in the uterus at the same time.
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