Are the air sacs okay?

[Little Cute Lily]

Hello, it's my first time hatching duck eggs. I got them shipped from ebay and I've been monitoring their growth. I check for movement and they seem to be doing good. My concern is the air sacs seem to be a weird shape. Also I have no idea if they are too big or too small. I didn't pencil the air sac growth and now it's a bit hard to tell if they're the right size. Below are 3 pictures from yesterday (17th day) at different angles, and one photo from a week ago (11th day)

 

[Artichoke Lover]

If I’m seeing this right the air sack is on bottom. Eggs should never to left sitting with the air sack on bottom. Are they sitting like this in the incubator?

 

[Little Cute Lily]

If I’m seeing this right the air sack is on bottom. Eggs should never to left sitting with the air sack on bottom. Are they sitting like this in the incubator?

Yup air sack is on the bottom. It's just for candling that I put it on its bottom for no more than a minute. In the incubator they are flat on their side with the top pointed downwards. They are turned by the incubator so that they sleep on a different side each night. I wasn't sure which way to candle them so the photo from a week ago it was candled bottom side up. The other 3 photos the bottom side is down against the candling light.

 

[Artichoke Lover]

Yup air sack is on the bottom. It's just for candling that I put it on its bottom for no more than a minute. In the incubator they are flat on their side with the top pointed downwards. They are turned by the incubator so that they sleep on a different side each night. I wasn't sure which way to candle them so the photo from a week ago it was candled bottom side up. The other 3 photos the bottom side is down against the candling light.

Okay I was just making sure.

 

[Percipen]

I think our eggs are pretty close in age. I have 6 incubating on day 23 today. 2 of mine have the same shape air sacs as yours and they are looking healthy so far. I didnt think too much of the shape as long as it's a good size for them to get enough air

 

[Artichoke Lover]

I think our eggs are pretty close in age. I have 6 incubating on day 23 today. 2 of mine have the same shape air sacs as yours and they are looking healthy so far. I didnt think too much of the shape as long as it's a good size for them to get enough air

Day 23 on chicken eggs? Chicken eggs are supposed to hatch on day 21.

 

[Percipen]

Day 23 on chicken eggs? Chicken eggs are supposed to hatch on day 21.

No I think we're talking duck eggs here... They take 28 days to incubate

 

[Artichoke Lover]

No I think we're talking duck eggs here... They take 28 days to incubate

Missed the duck part lol. Was really concerned for a minute