Girl sat in front of me in class on monday and was coughing and sneezing. It's saturday, I have had a sore throat ever since, but no other symptoms.

Could be related. Most of the viruses that cause "colds" can cause a variety of symptoms. If 10 people get the same virus some will get fever, some runny nose, some sore throat, some fever. Some might get all of those symptoms listed and others can be infected and get no symptoms.