Hi i found an abandoned duck nest and saw the dead mother next to it so I took the eggs to try to hatch them. I’ve had them for 16 days but I know that they have been alive for at least 23 days because I saw the nest before the mother died. Anyway, there was 6 but now there’s only 2 left because the other ones started smelling bad. these last 2 dont smell bad but I haven’t seen any movement when candlung. Also the shells have some discoloring and spots on them. I have no idea how far along these eggs are or if they’re even alive. how Much longer should I continue to incubate them? Or are they dead? I will attach pictures of them. PLEASE LET ME KNOW WHAT I SHOULD DO!!!