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[–] 40 points 2 years ago

https://en.m.wikipedia.org/wiki/Implantation_(embryology)#Implantation_failure

Reproduction in humans is not very efficient. Only around 30% of natural conceptions result in successful pregnancies. Of the failed pregnancies around 85% are due to implantation failure.

Seems like it's extremely normal for a fertilized egg to fail to implant and be flushed out during your next period.

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