My (albeit imperfect) understanding of IVF was that the procedure routinely involved the implantation of several embryos - in the "hope" that at least one would "take."
I assume that, if more than one embryo "took," the medical team would then go in and "remove" (abort) the "supernumerary" embryos.
Please correct me if I'm wrong!
Regards,
Remember Octomom? She just refused abortion and carried all embryos to term