I candled three of the eggs that I put in the incubator on 6/4/19. I have been still adding eggs to the incubator over the last week until today. One of the original three had a reddish ring around the midline of the egg's center circumference. I am assuming that one is dead. Two other eggs form 6/4/19 definitely have veins and movement inside, but I do not see and air sack at all. This is the 11th day. Surely I should see an air sack right?