Pekin egg day 29 no internal pip

[Jessfin]

I had incubated 6 Pekin duck eggs. So far only one had hatched out of 6. Should I be concerned about the others? They show no sign of pipping they have sign of reddish/purple spots that can be seen on outside of shell. I have not opened or candled the eggs as it’s to be in lockdown. It’s not day 29

 

[DucksAreBest]

I had incubated 6 Pekin duck eggs. So far only one had hatched out of 6. Should I be concerned about the others? They show no sign of pipping they have sign of reddish/purple spots that can be seen on outside of shell. I have not opened or candled the eggs as it’s to be in lockdown. It’s not day 29

Could you candle them? There's no harm to candle them on lockdown.