My period was two weeks ago and only lasted three days, today i have a brownish discharge.

Ovulation?: It could be ovulation or an infection in the vagina. You could also just have a hormonal imbalance from stress, infection, herbals, antibiotics, etc...that is causing the bleeding to be abnormal. If you have any itching, burning or pelvic pain, I would get checked now. If not, keep track of your bleeding and period symptoms for the next few months - if it is still irregular see a doctor.