Hi,
Welcome to ehealthforum,
The brown discharge and the early periods that you describe could be due to implantation bleed, if you had been sexually active without protection after finishing with periods (as you get closer to your fertile days/ovulation time after finishing with periods). Wait and watch for your next periods and look out for development of any new symptoms suggestive of pregnancy. If you do not get periods within 10 days of expected period dates, or if you get abnormal periods, or if you develop any new symptoms, or if you suspect chances of pregnancy, you should consider visiting your doctor/gynecologist for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately). Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet and lifestyle.
Take care.