Do You See What I See?

Mrs Blue Tit has spent the past five nights sleeping in the nestbox.
Video clip of her settling down the first night:



Most nights she has avoided sleeping in the middle of the nest.
Also she is careful to keep to the edge of the nest during day visits.
From past experience that should mean she has started laying but not ready to incubate yet,

This morning I managed to grab a poor video snapshot when she left the nest.



Near the centre of the nest it is possible to make out at least one egg.