Hey I Have A Question.ok So.i Had To Take A

Hey i have a question.ok so.i had to take a drug test for my job and they said the results said i tested positive for barbituratesand methadone at the time i had 4 prescriptions
CYCLOBENZAPRINE,IBUPROFEN 600MG, OXYCODONE/ACETAMINOPHEN, CLINDAMYCIN 300MG So they made me take another drig test a week later and i tested negative could i have gotten a false positive the first time.