You are gonne get yourself in trouble so lemme set you guys straight ( in a friendly way, not being an asshiole )
Deca does produce progesterone and there are only 2 things to fight that, Bromocriptine which is nasty and makes you feel like shit, and Dostinex which is way better and very expencsive, also running Deca alone is just stupid, you would want to run test as well, say if your running 300mg of deca a week, you would want to run 500mg of test ( sust250 ), the reason for this is that deca will shut you down hard ( translate pp no worky ) and the test is their to even it out, also you want to stop the deca 1st, while continuing your test for a week or 2. 3 weeks will be waisting your money and time, you would want to do at least 6-8 weeks deca with 2 extra weeks of test, followed a PCT with Nolva or arimadex, clomid, maybe even HCG... if at any gyno starts during the cycle hit it hard with Dostinex and Arimadex becasue you wont know which ( estrogen or progesterone ) is causing it. for pct use both as well. As with any of this stuff guys, you cant play at it, you have to find out everything that can happen and be prepared for it, please research and be very careful about what you put in your body.