Pegnant finch behavior, how to identify pregnant finch

Here is 5 Sigh of pragnent finch bird

1, Nest building
Before starting eggs finch bird start to creating there nest.
2, Mating seen
If you see your finch bird are mating then within next 15 days they will start laying eggs.
3, Breeding box
Female bird spend more time in breeding box. They like to be separate on there nest.
4, Cooing
Cooing is a big sign of breeding
5, Protective attitude
Female bird show Protective attitude about there nest and breeding box.