Can Metformin or Clomid cause methamphetamines to show up on a drug test?

I got a job offer today. I went in to fill out paper work, set up a date for finger printing, and to take a TB test and urine drug test. The urine test was positive for methamphetamines. It will be sent out for a more in depth analysis. I'm not a drug user. I'm assuming it had to have been either the Clomid I started 2 days ago or the Metformin I started a couple weeks ago. Any ideas if either one can cause that?!