I was driving on the interstate and then my car started making this fluttering noise that sounded like when you go up a rollercoaster except if you went up them at 100mph. It only seemed to happen at above 40mph-ish, or at least it wasn't noticeable when I dipped below that. It stopped making noise altogether regardless of how fast I was going for the last 20 minutes of my ride home so I thought it fixed itself until I got out and saw... this:

[![Chevy Spark 2016 wheel with full plastic hub cap, on vehicle.][1]][1]

I don’t know much about cars and haven’t been able to reach any mechanics because of my work hours. I am wondering if this is something I could postpone getting fixed until next week or if it's a "please get an Uber to work or you will die" situation.

  [1]: https://i.sstatic.net/1LlQa.jpg