Woah hold on a second. Regurgitation is a very serious matter. If your snake partially or wholly regurgitated a meal, then let him rest for at least 8 days. This means no handling or feeding.
After this time, you may wish to start him up again with a very small pinky or even a pinky head. If you feed him a small pinky then get your parents to cut a slit in the back of the mouse, as this aids digestion and fires up his appetite.
Don't bother changing the bedding now, just leave him alone for 8-10 days, only go in there to change his water once every few days. Changing the bedding would risk stressing him even further, making him less likely to eat next time. I doubt he regurgitated because he was 'sick' but more likely because either the pinky was too big for him, it wasn't warm enough or simply wasn't fully defrosted. Just let us know how the next feeding attempt goes.
Hope that helps!
David