When you fess up to the FAA is important. The way I read it is you have to tell them when you get or renew your medical. I would make sure that is at least a year from when you were fined? But free advice is worth what you pay for it. You don't want to spend the rest of your life answering yes to: Have you ever had a medical denied?

PS. There are a couple of threads in the aviation law section below that might interest you.