No, just wait on it. My wrx does the same thing. The speed of the engine is oscillating, and when the revs get low your car will shake (just like it does before you stall, if you do). I don't know why they do this, but it's normal. If it's still doing it A LOT after a thousand or so miles, then I'd take it to a dealer, but if it's not excessive, it's normal.