My car is having a pull towards the left side!

I have a 1996 Aspire. For the last one week it has a slight pull towards the left. I got the alignment checked in Etobicoke. The alignment seems to be fine and so are my tires. I also checked for the signs mentioned in this blog http://www.serviceplus416.com/service/how-to-know-if-your-car-needs-an-alignment/. Everything seems fine! What could be wrong with my car? :| Please help me out! The only thing I haven't checked is my suspension. Can this pull be because of my suspension?

The alignment shop should have checked your suspension. Start by checking air pressure in tires. Move front tire to rear especially if you installed new tires. On a cement floor measure distance to floor from center of wheel wells. Spray a wet area on driveway cement or blacktop and watch tire marks to make sure car is running properly.

You may also want to jack up the front of the car and see if your tire has any play in it... The steering should be tight and the tire shouldn't be able to move side to side