Had brownish color discharge my period was the 14th of this month then today i was spotting red blood! its not constant its off and on?

Many possibilities: It depends on your history, medications, exam, and symptoms. A qualified doctor will be able to examine you, rule out pregnancy, polyps, cysts, infection, and when appropriate, perform additional testing such as ultrasound, cytology, cultures, lab work, etc to determine the cause. If your periods are usually regular, you may have just had an irregular cycle/anovulatory cycle. Go get checked out.