Is something wrong with my duck?

[katelyn19]

Hi last year I incubated 5 ducks for a 4-H project. I gave them to a family friend who ended up not providing proper shelter. I took the two remaining ducks back(one girl and one boy) and now the girl is sitting on a nest of 14 eggs. She had been sitting on them for a while so I candled them. None of them had any veins or anything. I took some of the oldest ones out of the nest because they had an odor. I opened them up and there was indication they were fertile eggs, but there was no veins or anything in the egg. Any information or help would be greatly appreciated. Thanks