I have 13 eggs in my incubator ranging anywhere from 1-8 days old. 8 days ago I put my first 3 golden polish eggs in the incubator (My girls first lays) and have continued to add new eggs everyday. Yesterday I candled my eggs and i can clearly see growth in my egg labeled 1 but 2 and 3 are infertile. So out of curiosity I candled up to egg six(5 days old) and I noticed only 1 and 6 are fertile. Is my rooster just not getting the job done? or is this because it's the girls first lays?