It would seem so obvious wouldn't it - and raise the guilt levels of anyone who didn't get to hospital in time.
Also well-meaning idiots who advise lying down, drinking cold drinks, eating sugar etc. Also the very little known fact that a baby in distress is likely to move more before they die - which is when they stop!
Just before I got pregnant with my first-born, my friend noticed her son had stopped moving, and by the time she got to hospital he was dead.
This made me paranoid in my first two pregnancies (in fact I was neurotic in all of them). I regularly went in if I didn't feel them move.
When pregnant with my third, I had lots of concerns, not shared by professionals, as she was healthy, I was healthy, and she was growing well.
One night she moved more than ever. I had no idea that moving more was a warning sign.
I did the stupid cold drinks, laying down, etc... I distracted myself (thinking she was fine last night, and she never moved as much during the day.
As a poster above said - I didn't want to know.
Of course they couldn't find a heartbeat at the hospital. I was full-term, two days away from her planned birth.