Sad day today, this is my 2nd batch of eggs ever ( non from out first batch last month hatched) and I have 2 eggs that I believe are going to make it out of the 8. Well I went out today and one was crushed and had a thick yolk hanging from it. I took it out after moving mommas (2 hens are sharing this broody job

and finished pulling the rest of the shell off and there was a dead fully developed baby. I think it would have had only a day left. I can't figure out what would have crushed it unless maybe a guinea did ( my guinea for some reason thinks she had to lay her egg in that nesting box. I hope my other egg makes it. I'm so disappointed that would have been our first baby!
I thought about moving the nest box with mammas on it to a different coop without anyone but some 2 month olds in a pen in it, but afraid the change may make mammas abandon the eggs and potential baby that may have a day or two left. Suggestions?