When I drive my vehicle, there's thumping below my feet (driver side under car)

Hello, usually something like that is from a tire noise or perhaps an axle noise. Hands on - eyes on - ears on testing is needed by a trained tech who can examine the steering and suspension and tires to see what may be causing the noise. If you had a tire that has a slipped belt or a bubble, for example, this is quite possibly causing your noise.