Don't be surprised if a letter arrives, Schools are under pressure to maintain high attendance figures - as long as you/your parents know the causes are genuine you have to accept it.
At 10 years old my Daughter broke her arm quite badly during a PE lesson, I kept her off for the briefest time possible due the weight of the very large cast making her walk badly, that yerar's Parent evening was a string of tuts and sighs re the few days off despite the teachers being fully aware and in some cases present when the ambulance was called.
Such is life.