Period started early??? Help

Kit

Okay so my last period started Jan. 4 and ended the 15th. Right now I'm currently sick with the common cold, not fun lol. I went to the bathroom and notice a dark brown on my panties. Okay so dark blood, but why is this happening all of a sudden??

Am I okay? Should I see a doctor?

Why would it start early, assuming that it is my period. I'm just worried and a little scared.