My boy said fake piss was the way to go also .I have googled It and got alot of mixed reviews but I know two ppl that use it and they both say it works
Drink a protein shake (body builder/weight lifter stuff) a few hours prior to the test. Put some bleach on your finger and swirl in cup of piss, fake piss, piss clean kits. All of these things have a good track record IME. Good luck and congrats on the baby