First Little Death wobble

Hey, um, I had a tire change today. I warmed them up thoroughly. Then at some point I got on the highway and had my first minor deaf wobble. It was really only brief, but I was obviously pretty scared, and I'm wondering if it had something to do with the new tire or if I did something wrong. Actually, I was driving like I usually do. I was doing about 200 km/h, but should I be worried that the mechanic did something wrong with my new tires, maybe they weren't balanced properly, etc.?