I have not opened my incubator for 3 days - and the chicks are hatching this morning. Three are hatched now and 2 pipped.... one of the new hatchlings still has the yolk sac attached - will it be OK? It is reddish looking and about the size of a nickle and still attached and dragging behind it as it hobbles about in the incubator. This is my first chicken hatch, but I have had two quail hatches earlier this year.