Eggs not looking good - Please help

[Mequita]

Hello there,
One of my ducks have been sitting on her eggs (10) for over 4wks. I'm not exactly sure when she started to hatch but it feels over a month. I don't dare to take the eggs because I'm scared they are forming but some look very dark. Something tells me that they are bad eggs or unfertilized ones. I've been feeding her especial stuff like oatmeal, eggs, veggies, so she doesn't get sick on me.
What should I do? How do I know if they are good eggs? I'm scared I'm going to throw away a duckling.
Please any advise would be really appreciated

.
Kindly,
Sandra

 

[GitaBooks]

If its been over 31 days since she began incubating (not since they were laid) then you could try opening a few you aren't sure about. You could give them a few more days. If they are all dead, you could buy her a few ducklings.

I hope this helps: https://www.backyardchickens.com/t/304863/duck-egg-candling-photo-diary

Best of luck!