DAY 29 NO PIPS HELP

[bethkitty]

It's day 29 on incubating 3 indian runner duck eggs ... they were all moving and fertile and had good blood vessels on day 25 where I did 'lockdown' .... humidity is where it should be I think (there is condensation on the inside of the incubator and damp cloth inside etc) yesterday one of them was ever so slightly rocking ... I've tried candling them through the plastic (I don't want to open the incubator) and it doesn't seem like they have pipped atall ... is this normal? I've been trying to wait patiently ... but I'm worried as most ducklings have atleast internally pipped now .... HELP

UPDATE ONE HAS PIPPED INTERNALLY
WHAT DO I DO