I recently bought a Brinsea mini advance to use in my classroom. I thought I should do a practice hatch at home first, so a friend from church brought me several eggs from her place. She mentioned that she didn't know if they were all good ones, since her hens had been hiding eggs around and may even have been sitting on them. So, I candled them all and chose the ones that seemed smaller on the inside to put in the incubator. Now over a week into this project, I see some eggs that don't seem to be growing at all, no blood vessels or dark spots of a eye. The other eggs look to be about half dark, but do not move around in the eggshell, just seem stuck to the inside of the egg. Is it time to start over?