if you only have a couple of plants they are not gonna sweat you. you would probably get a misdemeanor possesion ticket. maybe some other charge, i'm not sure about the "manufacturing" charges for weed. the letter from your doc might help, but if it's illegal it's illegal. if you do/did get busted you will more than likely plea bargin to probation. probably anywhere from 3 months of mail in to 1 year of regular check in. just a guess though.

-shake