Are you an expert on IVF?
http://www.ivf-infertility.com/infertility/infertility5.php
As one who has gone through the process, both terms, implant and transfer, are proper, while implanting “multiple embryos” is not.
Most reputable IVF programs adhere to guide lines limiting embryo transfers. Embryos do split but the chances are rare.
http://www.cbsnews.com/stories/2009/01/30/earlyshow/health/main4764432.shtml
Octuplets’ Family Filed For Bankruptcy
EXCERPT
On The Early Show Friday, the scientific director of an Atlanta-area fertility clinic blasted whichever clinic did the implantations, saying he's “stunned.”