One of the more uncommon but dreadful nightmares of IVF is having your embryo implanted into the wrong person. That’s exactly what happened to this couple. Their last frozen embryo was implanted into the wrong woman. Human error can and does happen with fertility treatments including IVF. Thoroughly research IVF and fertility clinics before proceeding with treatment. Make sure to get references and referrals from people who have experienced a particular IVF clinic you might be interested in.