Thanks to all who offered advice or shared their personal experience with this type of situation!
As a newbie to braces, I was concerned that the swallowed bracket could have caused a problem in my digestive tract...only because of the hook on it. However, when I went to the ortho today to get a new bracket, the ortho asst told me not to worry about it. She said, just don't make a habit of it. Well...it wasn't like I intentionally swallowed the first one. I didn't know that it was MIA until I was brushing and flossing after dinner. Hopefully the new bracket is well attached...I don't want to swallow any more brackets...at least the ones with hooks...even though it is apparently OK if it does happen.