It will be easier for you to know if they are duds or not if you wait till day 7 thru 10. I just did my first hatch and they all hatched on Halloween. I couldn't see anything up until day 7 and on my darker eggs I couldn't see anything until day 10.This is my first hatch too. Candling on Friday - day 7. How easy was it to tell which were duds and which weren't?
It all depends what color your eggs are. The lighter they are the better to see them. The darker the egg, the harder time you will have seeing anything especially if you are doing your first hatch.