Define "sad"

Work roommate: oh my god this story is so sad! This woman had IVF after trying to get pregnant for years and years. When she went for the sonogram, there were three heartbeats but one baby was sucking up the nutrients or something from the others and so she got an abortion to save the one because she didn't want three!
Me: that's not sad; it's common and rational, especially with multiples from IVF.
Work roommate: it's kind of sad?
Me: no, that's not sad.