A huge percentage of pregnancies end in miscarriage, very often before the woman even knows she was pregnant. This is the same. She should have to take special care of the mass her body rejected just because it was in there a little longer? What's the cutoff for having to report that you had a miscarriage, then? Every period? Every time you have a period that's a week or two late, because that is reasonably likely to have been a miscarriage?
This was a non-viable fetus. It was never going to be a person. It's not a corpse.