Hello! This is my 4th time incubating! I haven't hatched any though. They reach days 18, 19, and 20, then they die!! Today i was getting rid of eggs and I almost through one away! I opened it up in the air sac area and saw no movement! Just then, the chick hit the air sac as if it were saying, "I'm right here!" So I rushed to put him/her back into the incubator, but i have it with the large end up! Is that ok?