You don't sacrifice one person's life for another
For the sake of argument, I'll accept the entirety of your post as you meant it.
Now, the embryo that was brought into existence through IVF will now either a) be thrown in the trash, possibly after dying a natural death in the freezer, never having developed beyond a few cells or b) be used for research that has the possibility of saving lives.
This is in no way comparable to abortion. This is directly comparable to using the organs of a person who is now brain dead, and will die shortly.
Most compassionate human beings want to help the living, not the soon-to-be-dead.
In the real world, that's the choice -- let them die a meaningless death, or have their lives mean something.