I've just watched yesterday's episode and it broke me. I had tears pouring down my face because I'm in Abigail's position.
One of my DC was a twin, thanfully due to ultrasound we knew. Unfortunately my little girl died and we only found out when she and her sibling were born.
It was disasterously handled, actually - my waters broke and I'd gone into labour a week before a planned CS due to breech presentation of one twin and monitoring during labour failed to find both heartbeats (like Abigail) but it wasn't actually until my little girl was born silently after her surviving sibling that it became clear.
Her surviving sibling just started Secondary school, so it wasn't that long ago BertieBotts. 
"Their" birthday is still very very painful but we were able to hold her and say goodbye. We have photographs, a lock of her hair, hand and footprints and we were able to have a proper funeral.
I NC because my circumstances are very identifiable; I chose today's date.
Love to all of you who have lost babies, siblings and other relatives.