You can do cardio on a bulk and to be honest I would recommend it. Adding in some light cardio on your off days will help keep the pudge down from the extra calories that you are consuming, especially since your current routine only has you in the gym for three days a week.

Something along the lines of fast walking or light jogging on an incline treadmill would work nice, but its really whatever you like to do. They key is just to make sure its not too intense.