Ah yes, that is apparently the medical way to refer to anything from a fertilized egg (zygote) to a neonate (newborn) appropriately, regardless of the many stages between the two. Ultimately, it conveys what's so desperately important about pregnancy: that what a pregnancy is, is defined by the woman carrying the pregnancy. To lose a planned pregnancy is a terrible, difficult thing for one woman; an abortion, for another woman, is the relief at the end of a terrifying few weeks.