Can an NDB (non-deductible breakfast) be counted if I am not notified at the time of the NDB?

No. One of the requirements of a non-deductible meal is that the Background Actor be freed of all activity. You are obviously not freed of all activity if you have not been notified as such. A general announcement qualifies as notification. The other requirements of an NDB are that it must be 15 minutes in duration, within 2 hours of your call time and given for the purpose of synchronizing your meal time with the crew meal time.