FlyerJosh is absolutely correct.
Don't wait. Contact the FAA now. You do not want to be viewed as a liar.
My situation is a litte different. I'm applying for my 1st Class Medical for the first time. Sent off for the NCIC report and came clean from the giddyup; 1 bad check conviction and 3 dropped charges - bad check; battery; felony burgulary. FWIW, the local AME is backing me 100%.
I always wanted to be an airline pilot and I can tell you this...this is a
very humbling experience 
!!! I should hear from the FAA within a week or so. If I'm awarded my medical, I'll probably feel like the character that Will Smith portrayed in the movie, "The Pursuit of Happyness". If any of you saw the movie, remember how the character reacted when called in and told he had gotten the position. That's about how I would feel and react.
atp