hey there I had mine here in Southern Cali too. I personally did not want to go in early because like somebody here said, i was to embarrased to be rejected. So i stuck with my appointment date. But you can TRY and see what happens. I wouldnt recommend hopping from one center to another because you were given that one for a reason. As far a medical there is None whatsoever. Time Wise it took me longer to find the place than the actual time the whole process took place. about 10-15 min.