Nearly all speedos read over, by as much as 10%, so if yours said 34, chances are you were really only doing just over 30. You would have noticed the camera flash if it had, so if it didn't then you weren't going fast enough to trigger it.
Not all cameras have film in either, so some the flash don't even take a photo.
As a new driver though you do need to be careful about your speed because of the 6 points rule. Make sure when you come up to a camera, your speedo is saying you are at least a couple of mph under the speed limit just to be safe !