hey, got 5 duck eggs that are pure breed welsh harlequin and it is day 31 and not one has even internal pipped. all of the are still alive, I put a small hole at the top and the two that had no movement I made a small slit above the beak in the membrane and they were alive. still lots of blood in the membrane and quite some yolk attached (I had to make a larger hole in one as it was mispositioned and needed to be corrected, that is where I saw the yolk) now I want to know what I should do and what caused such a late / no hatch (so far) they were pulled out, sat for 30 minutes and wetted every day humidity is nice and high and not a single internal pip. one has been shadowing for the last couple of days but made no progress but hasn't slowed down, very active. so at what point do I intervene? I have only ever hatched duck eggs once before and they hatched a day late. thanks for any advice.