A 5th egg was laid this morning, April 13, just before 8 a.m. It was laid on the left side of the box, in the scrape that she seems to be most interested in incubating. Four eggs is the average clutch but more can be laid (obviously!) especially when we are dealing with a first time nesting situation. More proof that Durand's hormones are fluctuating! Let's just hope that some of the 3 eggs in that scrape are fertile and that she concentrates only on those eggs from here on out and is not distracted by the others.
The primary job of the male during the incubation phase is to provide food for Durand. He should also take over incubation duty when she leaves the nest to eat. Keep in mind this is likely his first time nesting as well, so it may take some time for him to realize what he is supposed to be doing. He has been in the nestbox with the eggs, but as far as I know he has not attempted any incubation duty yet.