Do you think I'll pass this drug test?

Hello. So I'm finishing paperwork for a job at safeway today. They are gonna give me a mouth swab drug test. I live in Cali and am a medicinal marijuana user. I read online to stop a few days before, rinse your mouth out with hydrogen peroxide and you'll be fine. I haven't smoked in 5 days now, and will be doing the hydrogen peroxide. What are my odds of passing the mouth swab test?