We are on day 19 and I had a couple of questionable eggs so I candled them. Everything looks good in all but 1. It is really dark inside and I can't see any movement or veining but there is no blood ring. Would that make it a quitter or is that normal for day 19 in duck eggs? I know when there is no veining and a blood ring is present that it's bad news but I haven't seen one without veining and without a blood ring.