Another post from me, I'm such a worrier as a first (and maybe only!) Time incubator! Today is day 9, and we have 6 duck eggs with veining. I wanted to be sure these look right. The dark spot has veining and a little embryo, and I think the clear spot on the fat end is the air sac, but the clearish spot on the back side, will the duckling just fill that in as it grows? Look normal for a duck egg at this stage of development? Thanks!