Are you kidding?
Maybe only one embryo is implanted but many others are destroyed.
Do you not believe a human embryo is a human being?
Actually in one procedure they will create 3 embryos and implant them in the mother hoping one takes. The only loss of embryos occurs if the mother uterus does not take to then, which has resulted in the increase of twins and triplets now in the procedure.
This has been done to help couples manage the issue of embryo destruction, way more expensive option though..