There are people who have "fetus showers".... but we all know... those are really baby showers...
A woman who has a miscarriage loses a child. Does she not? A couple who discovers "they" are pregnant celebrate and care for the child who is developing and on the way...they don't sing to the fetus and plan for the fetus... People who adopt from a mother who decides to give up her baby celebrate and look forward to the birth...And follow along as the baby develops. When our children were growing and developing, we did not refer to them as anything but our babies....did we?
It's pretty clear when and why "blastocyte, embryo, fetus" are the go to words....
I do not care what you "refer" to them as. A fetus is a fetus; an embryo is an embryo; a blastocyte is a blastocyte. If you "refer" to any of them as a giraffe...that would not make them a giraffe.