Oh ok that is awesome... I thought maybe the membrane was stuck to the shell or something. This time I candled I could almost see the heart beating, and I can't imagine losing one at this stage (even though there's 3 more weeks to go). 3 of them are still empty, so I'm guessing they're infertile but I'll still going to give them another few days.
And the anxiety doesn't end there! But it's worth it in the end. Be prepared for lots of hovering as you wait for 'something' to happen.
for a great hatch!