I have never heard of this - I have heard of embryos not making it through the thawing process - but this is probably a human error, so they should fess up to that... I know we signed many "Waiver of liability" documents when we had our embryos frozen and I am sure human error was one of the issues that the clinic protected themselves from in these documents. But, they should admit to this mistake. I am sorry this happened to you... I am sure I would be pretty upset if this happened to me, but unfortunately I am sure this kind of thing happens in every clinic... Good Luck with your FET.