Is it possible that my eggs (which came all together, look identical, and went into the bator at the same time) could be developing at different paces? When I candled on day 7, I only saw development in 5 of 14 eggs. Today, day 11, I think I see development in 7 of the 9 which looked clear on day 7. These 7 eggs look like something is happening but they don't look as developed or as large as the to-be chicks in the 5 which showed development initially. Thoughts?