I have chick eggs that were set at 6:30 pm on 6/7. I candled them for signs of life tonight and one of them looks like it is trying to get through the membrane between him and the air cell but it just keeps stretching with his beak. Is this normal? I just cracked open a bunch of "bad" ones and it seemed like some of the membranes were on the tough side. These were eggs though that either didn't develop at all or quit around day 12/13. I have 6 eggs left. 3 with definate movement and 3 that had great movement at day 18 but now I just can't tell.