Drug Test Experience

My parents found a bowl in my room a few months back and bought a home drug test (firstcheck) but never used it. i tested myself this morning for fun, and the control strip tested pos, which means i tested positive for methamphetamine, cocaine, opiates, and THC. WTF? i havent smoked weed in 3 months ( read my other topics ) and i dont do blow or china. the meth is cause i take 54 mg of concerta every day. ill post a pic later of the drug test.
why did i test pos for the other three? does it really stay in my sys that long (THC)? does concerta have coke or opium in it?

what the fuck only thing possible was for weed

what did u do? piss or what

did u just eat ib profen, a popy bagel and some special brownies?

i pissed in a cup and took a dropper and took some piss and dripped it on the sample spot. after 10 minutes it came up with the control passed, meaning i had traces of THC, cocaine, opiates, and methamphetamines in my system. the meth is from concerta, im sure of that, but the other shit i dont know. when i took it, i hadnt smoked weed in like 2-3 months. i have nevvvver done blow or heroin, so i have no idea what this shit is from. last time i took ibuprofen or vikes was like 4 months ago, after i broke my ankle. im confused!