Finger Print Letter E Notification

lately i had been checking my n400 status online twice a day every day even on weekends. pretty crazy haan? anyways i kno us work week is 5 days long but I was wondering coz i was tracking others on immigration.com n visajourney.com forums that they recieved their witing 12 days. so I was growing impatience. well today I just checked n my status was still at initial review but the message had changed to that a letter has been mailed to me about my finger print appointment. finally things seems to be moving.