Adderal is an amphetamine, but it shouldn't test as "meth" in a good drug screen.
I happen to have a urine drug screen form right here, you can test "negative". Or positive for cannabinoids, cocaine, amphetamine, methamphetamine, opiates, etc.
The amphetamine and meth are two different "check boxes", and you should have tested positive for amphetamine. If you have a prescription in your name that shouldn't be a problem.
Best wishes.