Can We Add Silkie Egg To Duck Eggs In Bator?!??!

[kysilkies]

I didn't think about holding it off, the ducks have around 2 weeks left...Will the higher humidity hurt the silky egg even though it won't be ready to hatch?...Once the others do, we can lower it again for a few days, then we have to raise it again...Or, how long can we keep it laying around and what is the best way to store it during that period?...Thanx again!