bright brown watery discharge and my breast are sore?

Hi,
Welcome to ehealthforum,
Although irregular periods are associated with anovulatory cycles (menstrual cycles without periodic egg release from ovary), chances of occasional ovulation are possible. If the ovaries are functional and you have had occasional ovulation (and if you were sexually active around ovulation time), chances of pregnancy are possible. The recent symptoms that you describe could also suggest pregnancy possibility. Look out for development of any other new symptoms if pregnancy is suspected. If you get abnormal periods, or if you suspect chances of pregnancy, consider visiting your doctor/gynecologist at the earliest for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately).
If you have been trying for pregnancy, and not been successful, consider requesting your treating gynecologist about getting further investigations to look for underlying cause for the irregular periods, and get you started on appropriate measures to help you with getting pregnant. If you are trying for pregnancy, monitor cervical mucus changes and the BBT (basal body temperature) charting to predict your ovulation (along with the follicular study) and time your intercourse for having fruitful results. Have intercourse in positions that allow for deeper penetration for high deposit of semen. Have diet with foods rich in zinc content to ensure better maturation of egg and sperms. Consider being 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.