need motivation to call in sick

want to call in sick as i was feeling pretty shitty at the end of my shift possibly covid but its a bit of a flemmy cough. im not dieing but id rather rest at home and try to feel better before krimbo. struggling to actually call in though as i do shift work and i know itd make life difficult for my coworkers and flu isn't really seen as a good enough reason , half the staff in today were ill so i suspect i caught it from work the day before