I have never hatched duck eggs before. I have hatched chickens with no problem. I have a still egg incubator that has been running with no probems with temps. and humidity. The temp. right now is 100 and the humidity is 67. About a week before I put them in lock down I noticed that the egg shells started changing it was like them were almost transparent, they were kind of splotchy. I have not seen any movement or pipping. I did try to candle them and they all looked good to me. How long should I wait?