Eggs with no veins day 13

[ChickenCide]

Hello chicken lovers. I am pretty certain what this means, and if you require photos, I am not able to provide them, so this may not be the post for you, but anyone who can confirm my conclusion based off my description, I would appreciate.

This is day 13, 8 days left. 6 eggs in the incubator. Temp and humidity monitored and independently confirmed.
2 eggs that looked good on day 8 have veins, still looking good.
3 on day 8 had a dark spot inside, no veins, have had the dark area grow to cover approximately half of inside the egg, there is a visible air pocket, but no visible veins.
1 I can not see inside of at all.
I have been monitoring weight, expected weight assumes a linear drop in weight:

Start (expected) Daily loss Day 13 Weight (Expected weight day 13)
64.1 g Dark area .46g 61.2g 56.7g 4.5g above expected
70.7g Dark area .5g 67.2g 64.2g 3g above expected
67.0g (good egg) .48g 58.0g 57.9g .1g above expected
64.8g dark area .46 61.8g 58.8 3g above expected
67.6g (good egg) .48g 63.1g 61.4g 1.7g above expected
65.5 Entirely dark .48g 63g 59.3 2.7g above expected

Since I have been monitoring the weights, 1 egg is almost spot on, 1 is within 2 grams and the others that I am questioning are approx 3grams or more above where they should be which proportionately is significant.

I believe all 4 of these eggs are no good, especially the three with the dark areas, showing no veins that were questionable on day 8. I am not sure about the one that I just can not see into at all.

What are you thoughts?

PS the way this posted came out like garbage. I had everything spaced so the weights lined up and BYC destroyed the line up when it posteed it and I am not redoing it so, sorry about that, everything was lined up in columns and it made sense when i typed it out


UPDATE
Well I triple checked the eggs, a third egg seemed to have movement and some possible veins with extra hard scrutiny, another egg had possible veins, no movement at all, very questionable. Another of the initial questionable eggs i simply broke and there was nothing going on inside of it. The last questionable egg that is no longer transparent I tried and tried and could barely see any are that was transparent inside, almost the whole thing is dark despite having the usual amount of transparency on day 8 and being the same as the other eggs. That egg I am just going to wait and see what comes out.

 

[Yardmom]

The weights are affected by the amount of moisture each egg is loosing.
No veins is an indicator that the developing chick died. At almost 2 weeks you should be able to see the chicks moving inside the eggs. As far as the egg you can't see into, is it because the egg shell is to hard to see through? Some eggs are just not very translucent. If you can't see you just have to wait to see if it hatches (make sure it doesn't smell bad).

 

[ChickenCide]

The weights are affected by the amount of moisture each egg is loosing.
No veins is an indicator that the developing chick died. At almost 2 weeks you should be able to see the chicks moving inside the eggs. As far as the egg you can't see into, is it because the egg shell is to hard to see through? Some eggs are just not very translucent. If you can't see you just have to wait to see if it hatches (make sure it doesn't smell bad).

thanks for your response, the moisture situation you mention, thats why i was tracking the weight, I wanted more detailed info, see how the eggs track in accordance with expected weights. I agree completely agree regarding the eggs with no viens, I just was not certain if that is always the case or if there are exceptions. I'll prob pop one open and verify whats going on.
the egg I can not see into I am curious about, previously I could candle it just fine, its no different than the other 6 eggs, but for some reason it is completely dark. I tried different views but didnt get anything. I couldnt view an error pocket or anything. Maybe theres a little chick in there that pulled the curtains closed. Idk, i cant see through the shell now at all.

 

[Yardmom]

If you were able to see and now it's dark without an air cell then unfortunately that sounds like a bad egg.