I was given methadone almost 2 weeks ago and it was basically a one time thing and i just took a drug test at my pain management will it show up?

Probably not: Probably not. Methadone is a long acting opioid with a urine half-life of up to 2-3 days. Metabolties may last longer. Since it was only a one time dose, it is likely to have cleared by now. To be safe, tell your pain management physician about it.

Maybe: More likely to pick up the metabolite eddp. Why would you be concerned? If you are under the care of a pain management physician i would expect that they rxd the methadone. If it was not rxd for you then you using or trying the Methadone would be a warning sign for possible abuse and you should seek help.