There are a number of problems that would cause you to pull to one side or the other. If you are still under warranty, take it in and let the dealer figure it out. If you're not, I'd swap the front tires before you take it in for an alignment (put the right on the left and left on the right). If the car stops pulling or pulls the other way, you know it's the tires, not the alignment. I've had this happen a few times. If the car still acts exactly the same, then I'd go in for an alignment. With a car that new I doubt it's suspension problems unless you nailed a curb or something recently.