Help!! I just took adderall and I might have a drug test tomorrow!?

I am in college, and took 10 mgs of adderall yesterday, and 5 mgs just now, there is a chance that I have a drug test tomorrow evening, and I'm freaking out that it will show up as an amphetamine! I do not have a prescription, so I can't wave a slip of paper and be free. Is my concern based or is the mg's too small? is there anything I can do to help p it through safely and quickly??