awe! im so sorry! I can relate! my hen was sitting on 3 polish eggs and I broke one open to a perfectly formed chick. formed all they way to its date of incubation, day 15, with toenails feathers scales, egg tooth and such. I was so depressed. thing is, the egg smelled. I didn't get it, maybe it was dead, but anyways I felt bad looking at a chick I had no way of saving.
Thank you for the comforting words. Finding this whole grown chick... you just want to go back in time 30 seconds to undo it! I guess sometimes you just can't see see veins or movement and that we are human and we make mistakes. It stings for a while, but I will definitely be more cautious in the future. Although I thought I was already being very cautious!