Once the egg is put into the conditions necessary to hatch I believe it is a chick. Everything has started growing, everything has started the processes of life. Eggs are dormant until put into the hatching environment. Now, eggs that I'm planning to hatch would be, in my mind, chicks...not because the officially ARE chicks, but because I intend to place them in the hatching environment so they can start developing. My firm belief, with ALL living things, is that ONCE the fertilized egg is in the place it needs to be to grow/starts growing it is officially life.
I'm not one of the people to call unincubated eggs 'babies', but they would potentially be babies if I stuck them in the bator. Which is why I can understand why someone would be upset about their babies, because they would have been babies once they first started growing...but they never got a chance to, cause they broke...