Spinal, then catheter.
Prior to surgery, patients are catheterized to eliminate the need to get up and go to the bathroom during the first 24 hours of recovery. Having a catheter inserted is a routine procedure, but it's still not a very comfortable one. Be sure to ask your doctor and nurses to give you your spinal (or epidural) prior to inserting the catheter to eliminate any discomfort.
*As always, you should never ask for or take medication without first consulting your doctor.