What is the difference between swine flu and regular cough?

Ok... so I'm really paranoid about getting the swine flu because my brother and my mom both have it. I was sick over the weekend but not with the flu (a sort of tired out/headache/chill combo) and am better. Now, however, I have an irritation in my throat and cough once in a while. I know both my brother and mom had a cough at the beginning too but I am wondering if there is any way it is not swine.