simple answer to your simple question - YES. ABSOLUTELY it will show up and your UA will light up like a DIRTY light bulb.
My advice- If you are using methadone to get clean of opiates, stop using Opiates. Not to mentiom using both together can lead to a double habit (dual dependancy) and can lead to an OD since most people need to take more of the opiates when on methadone to feel the high than they did without it. Please be careful. Best of luck and I hope you find the strength to stay clean.