Natural Show or no?

Let me ask you guys for your opinions. Before I even bother trying to enter a natural show here in october. I took a 20 day cycle of deca in january. I was 178 before it and 186 after. However I bet some was water and whatever. But my question is do you think every one in these shows is 100% natural and that is would not be fair for me to enter having done 20 days of deca
(if I would even pass a test having taken any deca at all)? which was about 100 mg every 4 days. I dont take creatine or any other supplements. Only thing I take is my whey. Just loooking for opinions no flames.

you took 100mgs ofdeca for 20days??why wouldyou take it for 20 days only to make you fail a test AND not do a full cycle ofsay 12-16 weeks?bro itcanbe in your system up to 16 weeks post.i'm nto flaming,but what was the ideabehind20 days of deca?
fuck it.enter, if you fail have a bottle of cytodyne on you or something to save face.i'mjust confused right now

Straight up didnt know any better. My friend had it and let me try it. I simply just didnt know any better. I took 100 mg every 4 days for 5 shots.