What exactly did you hear?
Rumbles. I remember hearing the 1971 earthquake before it hit as well. That one had a roaring sound. This one I heard when I was in the kitchen. Grab the counter and stood there, then the shaking hit. It was mixed not too jerky, with some rolling. The jerky ones are the most scary because they are hard, fast, and hit in different directions.
The sound waves above ground propagate faster thane the shockwaves underground, so an observer outdoors or indoors near an open window will often hear an oncoming roar a few seconds before they feel the shaking.
Had that happen to me once in Anaheim Hills. The rushing sound was echoing all across the Santa Ana Canyon, then the place got a good rattle as the shockwave passed, then the sound died away as the wavefront continued on.