RN with a record, need HELP

I am so scared. I made a horrible mistake and need some advice. To make a long story short I became addicted to narcotics after injuring my back during a code. I got in so deep that I ended up getting in trouble with the law. Since this is my first offense my lawyer says i will just get a year's probation which I will have to serve before i can have my record expunged. I am not currently working and do not plan on applying until my probation is over. I am now clean, registered with the tennessee peer assistance program and attending narcotics anonymous meetings 3 times a week. My question is will the board of nursing find out automatically or will it have to be reported. Since i didn't get in trouble on the job it won't be reported my an employer. The BON (didn't give them my name) said when i renew I will have to check that I have been convicted of a felony and then it will be investigated but if i don't renew until my record is expunged I can mark no. Any advice?? Thanks alot.