PCT and the drug test.

I have researched this a million times, and cannot seem to find a solid answer. All I want to know is what PCT's show up in a drug test. Keep in mind that I am taking the Olympic Test. I know Nolvadex can show up as a PCT and a masking agent...why, I have no idea. But I want to know what I can and cannot take. I have to be 100%clean in Nov. and my cycle is Test Propionate, 450 mg week and HGH, 4 iu's a day. I am keeping it simple...its my second cycle, but my first one was like 5 years ago. My cycle ends at the end of sept. Thanks guys!