Criminal Law ASAP immigration

[wngsohio]

i had a misdemeanor for shop lifting, it recently got expunged off my record. i have to go into canada for work. Can i go into canada without it showing up, or do i have to fill out and send in the paperwork to get rehabilitated in canada even though it doesn't come up on my background check? i have to go there in eight days for work. i could get fired if i cant go into canada. please help