Remember that colds are caused by viruses and so most of the time you shouldn't need antibiotics. See your doctor if you have a high fever or fever for more that two days, a bad cough with shortness of breath or chest pain or you feel extremely ill. It's best to stay home if you are coughing, you don't want to infect your coworkers or fellow students.
Remember to cough or sneeze into your elbow to decrease the chances of spreading germs on your hands. Wash your hands often with soap and water and try to keep your hands from your face to decrease the chances of catching a cold from someone else.
Have a great day!