As one of my early instructors said - "If you ain't spinnin', you ain't tryin' hard enough."
Oops - that isn't politically correct anymore.
Seriously, if you are pushing the envelope (your car's and yours), you will spin occasionally. My first couple of years, I was pushing faster than my skill level was rising, and spun a few times at most events. Now I usually only spin once every 3 or 4 events. (Note to self, maybe I'm not pushing it enough?)
Don't worry about spins - just remember your mantra - "In a spin, both feet in, In a spin, both feet in, om, om, om, ...". If you follow that advice, you should be fine. Trust me - your instructor will help you remember if you forget!
If you are spinning because you are over-driving your skill level, that's not good, and we will ask you to back it down. If you spin because you gradually got faster in one area and finally got a little too fast, well, that happens to everyone at some point.
What is real important is that you understand WHY you spun and how to avoid it the next time. If you don't clearly understand why you spun, then you are just driving past your skill level and you will need to back down a bit.