Can Suboxone Show False Positive For Oxycodone?

I take suboxone from the dr. I drug test weekly and have never had a problem. Yesterday I tested and it showed dirty for oxycodone. How can this be? I know I didn t do anything and now they are sending it to the lab. Will the lab show that it isn t oxycodone or will it still show a dirty? I m very worried about this.