I set eggs precisely 10 days ago. I got this one egg - it was flat on one side and malformed. I didn't think it stood a chance of developing. The seller referred to it as "soft" and apologized but said she didn't have enough to make up the number auctioned without the odd looking egg.
I don't normally candle until lock down but, well, I was curious.
What I saw in that egg - and many of the others were babies swimming around. I had never seen anything like that before. Miraculous is hardly sufficient a word. I was, I am, in awe.