Once got pulled over by cop because he thought I was a drunk driver. Had to do sobriety tests. I was just distracted..by my mirror..ahem....and my car has always veered right. Dealer claimed cars are suppose to veer right versus left to avoid crash.
Distraction is something I think all of us have experienced. You soon learn to not get distracted, because it could end up costing you a bundle, your life, or worse, the life of someone else. None of which are worth the distraction to be sure.
Your car is out of alignment or you have a hung brake caliper.(worse case)
It should track straight for a reasonable distance on a straight, flat section of road once you let go of the wheel.
Any immediate pull to one side or another indicates a mechanical issue. Check tire wear also.