Duck Eggs Still Viable? Blood Rings..?

[DoubleDuck]

Hey ) I didn’t do so well on my first hatch, but after about a year, I decided to try again.
Instead of Welsh Harlequins, I’ve decided to incubate 7 Blue Swedish ducks.
I learned a lot from the first batch, so I’m hoping for good results... I candled today. It’s day 5.
Some of my detached air cell eggs began developing.. but I’m having trouble distinguishing from what a blood ring is and what simple veins are on a few of them.
Any help?

images here:

Egg 1 ^ detached

^ egg 2 detached

^ egg 3... normal but saddled air cell

^ egg 4... normal, but the air cell is HUGE, saddled. Worried about the location in regards to how itll position for hatching..?

^ egg 5, with a loose air cell

^ egg 6

egg 7 is the only one with no.. prominent ring around the forming embryo? I didn’t see these last time... but perhaps it’s normal?
Can anyone tell me if these are going to be okay?

 

[DoubleDuck]

I forgot to add, but here’s egg #7, which looks okay in my opinion <3

 

[BirdsBeesTrees]

They look fine. Leave them all in until you can see better on Day 14. Unfortunately bad air cells in duck eggs is a real problem in shipping.

 

[davez]

Those looks great!