Step one is pulling up the carpet, for sure. Possibly other furniture and flooring once the carpet is up and you can see the extent of the problem.
One month probably isn't long enough for any structural decay to start, so clean with mold killing chemicals, treat with a preventative, then put everything back together. I'd probably throw out the carpet and replace while you're at it.
Finally, a top to bottom detailed scrup/shampoo of the whole interior to kill any spores that you stirred up while fixing the problem.