Hi, I have had 5 pied call eggs in the incubator and about the 8th day, i candled them and they were fertile and saw babies inside it. Now, its 3 wk and i have had 2 eggs turn to bluish-bruised color and eggs are bad. Is this natural or what am i doing wrong??? I never had anything like this b4 and it makes me wonder. This is my 1st time trying to hatch call eggs.