They gave me a shot?

so, I got my wisdom teeth out this morning. Just the top teeth, I got the bottom teeth out already. I was recovering like crazy, and even eating solid foods, and chex mix, with like pretzels and everything. Then I went to lift my arm up, and it hurt... when I checked, I realized I had a band-aid on my upper arm from some shot. They never told me they were giving me one, and I didn't get one last time. They usually just hook everything up into the IV. What did they need to give me a shot of in my muscle? I'm very curious. And I was extremely confused when I found the band-aid XD I thought I'd gone crazy for a second!
They gave me a shot?
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