I dont't have any similar exp. but i was told by my parents that i was once a baby with no heartbeat at 4 months in my mum's tummy.
They went to seek 2nd opinon and they didn't gave up. Now here i am, already with 2 kids of my own.
Miracles happens, dont't worry. Your mood will affect your baby.
Just want to say, i'll be praying hard for you too.