I just called the FAA medical office at almost exactly the 1 month mark to confirm receipt. The lady on the phone said "Ok, it is in line for the reviewer and I will note on your record that you called" So I then asked if calling is OK or frowned upon. She said to call every other week in case they need additional information (this way you dont have to wait on the official letter requesting more information). She said calling does not change the amount of time in the que or jump anyone in line.