OH...so sorry about the 2 eggs.... Dont worry too much about that last egg being later - different breeds may be the reason. But also dont forget they are suposed to hatch day 21. You had some early- you might get one late too. What ever happens you have now successfully hatched your first chickens... Leave maximus for a while in the incubtor- you just never know- But definately candle before you dispose of any eggs. I even open some up as well just to be sure with the late ones. I make a very small hole in the air cell and check for movement.
I have 4 quail, 2 yellow and 2 tuxedo. They are just so tiny- and a bit noisey at times too.
So When do you want those duck eggs??? I have two maybe three ducks laying now.