Hello! Please can I have advice for an expecting duck mum
I feel stressed and worried about my eggs. Brought 6 Call duck eggs from eBay. All looked good when candling.
Around day 7 one died it had the ring of death.
Around day 18 another one appeared to of died too, the egg was mostly yellow with no veins when cancelling.
I now have 4 left. Two had obvious movement and good sized air sacs on day 25. The other two had smaller air sacs and I didn’t notice any movement but veins etc all looked good still. Today is day 28 and there’s no pipping. I quickly candled them last night (day 27) even though they are on lockdown, the humidity wasn’t rising and I wanted to add more water so needed to open anyway. Two still had movement. No internal pipping was noticed. One looked like it had blood spots on the inside on the shell (I’ll add a photo of this) and the last one looked fine but no movement was noticed. It was very quick candling so there may have been movement but I checked for all of 10 seconds.
My question is do they need more time or do they need help? Could they be dead?
I have a Brinsea octagon 20. Temp 37.9° Humidity 55%. Increased to 59% since lockdown.
Please help

Around day 7 one died it had the ring of death.
Around day 18 another one appeared to of died too, the egg was mostly yellow with no veins when cancelling.
I now have 4 left. Two had obvious movement and good sized air sacs on day 25. The other two had smaller air sacs and I didn’t notice any movement but veins etc all looked good still. Today is day 28 and there’s no pipping. I quickly candled them last night (day 27) even though they are on lockdown, the humidity wasn’t rising and I wanted to add more water so needed to open anyway. Two still had movement. No internal pipping was noticed. One looked like it had blood spots on the inside on the shell (I’ll add a photo of this) and the last one looked fine but no movement was noticed. It was very quick candling so there may have been movement but I checked for all of 10 seconds.
My question is do they need more time or do they need help? Could they be dead?
I have a Brinsea octagon 20. Temp 37.9° Humidity 55%. Increased to 59% since lockdown.
Please help
