hi, i'm new on here, and i need help fast! i go for a drug urine test tomorrow, i need to know if heroin shows up as the same as oxy on a drug test, i know they are both opiates, but would it show up different, i'm not an addict to heroin, i just tried it, but i just found out earlier today i have to go to have a piss test tomorrow. i'm prescribed oxycontin, would heroin show up different, please help