It can't hurt to have the alignment checked. It could, however, be a crown in the road. If the road is crowned, the road itself is pushing you to the right and you have to turn the steering wheel slightly left in order to go straight.
You can check this yourself by going to a fairly empty parking lot that is level. Drive in one direction and see if you have to turn the wheel slightly to the left. Then drive in the opposite direction and see if you have to turn the wheel slightly to the left. If so, then head for the dealership or an alignment shop.