The ducklings hatched fine. Two didn't make it though. Yes, two of them hatched three days early, both mallards. So maybe it's just there breed? I ended up putting them in lockdown a day early because of internal pips, and wiggling. Yours may hatch early though, try to check for internal pips...
I have six duck eggs in my incubator. And they started wiggling two days ago. Today, they were wiggling like crazy. Does this mean they will hatch soon? Should I get ready for lockdown already ?