Circuit breaker trips every couple of weeks
The only interesting information here is how many amps were being pulled on the circuit at the time the breaker popped. Breakers actually trip on heat, and a sign of a malfunctioning breaker is random inexplicable opening (tripping).

You could get yourself an Amprobe and watch it while a 'helper' turns things on and off and simulates normal activity in the room to see, however more than likely one of two things is going on:


You have a bad breaker, just get it replaced
Something (sump pump, maybe?) is also on that circuit, coming on weekly and tripping it


So, if you go the Amprobe route, you have to be there just at the right time to catch it. The event causing the breaker to trip might be happening fast enough for the tester you have not to notice it.

Replace the breaker (or have it replaced) first and see if the problem goes away. If it doesn't - figure out what's coming on at that interval that might be causing it. If the problem persists and nothing is suspect, have an Electrician take a good look at it, you probably have feeder somewhere that comes into contact with ground randomly.