Is It Advisable To Take Suboxone While On Percocet?

I hope so, I am taking percocet for pain issues (obviously) Anyway, I ran out about 1 wk before I'm due for a refill. I no this isn't the best thing to do, but my cousin gave me a suboxin so I can get through. I like to be honest with my Dr. I respect her and myself to much to play games. Do you think I will get in trouble for this? Should I omit this? Will it come up on a drug screen anyway? Is it a narcotic? What should I do?