New Duck Eggs

[WildLifeRescues]

Hello! I have a clutch of 6 duck eggs, and I'm noticing a VERY light red circle thats covering a tiny bit of one or two of my eggs. These are only about two days old (possibly three), and I see no development. Another egg had a ring around it yesterday, and now I only see a tiny red line (pictures attached). Another egg came with hairline fractures around it. Seems intact though. Are they still viable? Is this normal?
https://ik.imagekit.io/1ssht5tc8/IMG_2890.HEIC
https://ik.imagekit.io/1ssht5tc8/IMG_2889.HEIC

 

[casportpony]

Welcome to BYC. I'd re-candle in a few days.

 

[WildLifeRescues]

These duck eggs are about 2-3 days old. I see a ring (very faint) covering a little bit of two of the eggs. I can't tell if it's a blood ring or not, it's VERY faint. The other egg had a ring just like that one but it faded into a sort of line (pictures attached). Finally, the third egg has a large crack around it (hairline). Can I use nailpolish to fix this? If not, how do I seal it using wax - would the temperature change not affect the egg negatively? I'm not seeing much in these eggs yet.
Are the eggs still viable?
https://ik.imagekit.io/1ssht5tc8/IMG_2889.HEIC
https://ik.imagekit.io/1ssht5tc8/IMG_2890.HEIC

 

[WildLifeRescues]

Are they meant to be like that?

 

[casportpony]

Can you take more pictures and attach/upload them to your post?