I can write on this with experiential authority. Alayboy was the product of natural conception (but nonetheless our "miracle child"). We grappled with undiagnosed infertility for about 10 years before going the IVF route, with no viable pregnancies. When counseled by our doctors we were given the "option" of destroying any unused embryos. We made it absolutely clear that no embryo would be destroyed/aborted. If it had came to that decision of what to do, our choice was either to have more children implanted, or potentially allow them to be adopted.