All you can do is know that it's probably reducing the aggressive loss that would have occurred if you never took it. Mate, dont expect to suddenly have hair as dense as a unshaven bever because of it. The chances are its DEFINATELY doing something.
It does amaze me that you only had hairloss for 1 month... sh*t i recon i noticed it like 1-2 years before i started treatment... oh well at least you caught it early. How about you put a pic up so we can see what your talking about?