Emily, here's the thing: can you still breathe normally? If yes, you'll be fine.
It would be a good idea to dislodge it somehow (food and/or drinks are the obvious solutions; also, coughing), but if it doesn't impede airflow you shouldn't have any problems. Just make sure your parents know about it.
Charlie Stross's cheerful, optimistic predictions for 2017, part one of three.Lots of people advising you to call the hospital, but apply some common sense and have a discussion with your parents about it. After all, even if they don't concur, they'd find out anyway if you did call the hospital and an ambulance pulled up outside.
Charlie Stross's cheerful, optimistic predictions for 2017, part one of three.<hugs Nyan>
We technically can't call hospitals. In an emergency situation where you are not near a GP or a NHS walk-in centre, calling NHS Direct is where you go. If they think it's serious enough, they'll call an ambulance.
Which is what C should do after a discussion with parents.
edited 3rd Oct '11 3:54:55 PM by Inhopelessguy

Here lies Emily Snell.
Aged 17.
Died because she was too cowardly to get a blood clot checked out.