If you only took it the one time and it was a low dose you should be fine.
Usually takes 7-14 days.
Drug Approximate Detection Time in Urine using EMIT
Amphetamines 3-5 days
Short-Acting secobarbital 1 day
Long-Acting phenobarbital 2-3 weeks
Benzodiazepines 3-7 days
Cannabinoids 3-30 days
Cocaine 3-7 days
Codeine 3-5 days
Methadone 3-5 days
Methaqualone 14 days
Opiates 3-5 days
Phencyclidine (PCP) 2-4 days
Phenobarbital 10-20 days
Steroids (anabolic) oral 14 days
Decreasing detection times:
Increasing metabolism is probably the most effective way to decrease the time period that drugs can be detected in your system. Physical activity can increase your metabolic rate.