I'm so sad. I just heard from a friend.. She was 27 weeks and went for an ultrasound and the baby…

I'm so sad. I just heard from a friend.. She was 27 weeks and went for an ultrasound and the baby wasn't alive.. The cord was wrapped around his neck and there was no heart beat.. What can cause the cord doing this??? She also said the baby was moving that morning 😭😭 I'm sad and nervous that this can happen to any baby..... Poor thing.