Is this duck egg alive or should I pitch it?

[duck286]

I am on day 6 of incubation however this picture was taken last night on day 5. Does this egg appear as though it hasn’t made it? It has the dark spot but no veins like the others. Should I give it more time?
Thanks for any advice in advance!!

 

[sourland]

I believe it is non viable, but would give it a couple more days just in case.

 

[Kimmyh51]

Give it a few more days, may,be a blood spot, but I have had eggs that look like blood spots or blood circles suddenly turn into veins and beating hearts so you never know....

 

[duck286]

Give it a few more days, may,be a blood spot, but I have had eggs that look like blood spots or blood circles suddenly turn into veins and beating hearts so you never know....

Thanks for advice!! I appreciate it. I will give it a few more days