definately no male = unfertile eggs........ so don´t worry about boiling them or such.....

there is a site with candeling eggs, which is just placing a lamp behing the egg and see through it..... like when you lamp your hand and you can see all red light coming through..... but in the eggs you can see some sort of spot...

the site I mentioned is gone but there is another about other birds you can just google them and they show day by day candeling and progress.....