I Have Recently Had A Drug Test That Came Back

I have recently had a drug test that came back positive for benzos and I only take hydrochlorthiazide 25 mg, calcium 600mg, Goody's, seraquel, and recently began an antibiotic bactrim. Its the only thing thats different and this is the first positive test I've had... Please help me understand how I'm showing positive for something I don't take...