So you saw a lock on november 21st and expect that she would have lay already (12 days later)?My advice to you you need to do some research lots of it.
It's a bit more complicated than that first there is follicular growth which takes 4 to 8 months then there are things to look for such as the female cooling herself off, lumping ovulating having a pre-lay shed (10 to 14 days after ovy 30 days before laying) etc.....the information is out there.