What do I have, Can I go to gymnastics for an hour tonight??? (im 12)?

Saturday morning I woke up with a stuffy nose, Sunday I still felt bad but went to the zoo. I also have a cough, and felt short of breath, I felt like this Monday, didn't go to school. Today, (Tuesday) I took Robitussin DM at 6:00 A.M. I felt just fine, coughed a little, still felt a little short of breath, but thats from the stuffy nose probably. I didn't take it til 2, I had been feeling fine, but my mom made me take it. Im worried I have bronchitis, or is it a chest cold? My nose is stil very stuffy, but the rest isn't that bad, maybe because Im on medicine? Do you think it will go away on its own??