When the nestcam stream began at 09.30 37 was on the nest beside EB. If he was waiting to take a turn incubating he was out of luck as EB remained tight on the eggs.
At about 09.45 she started getting fidgety and at times she was straining. At 09.54 she gave a lurch and stood. Was that a third egg?
It wasn’t at all clear but analysis of the footage indicates that she did lay at that point. Here she is a little later turning the eggs.