Hello, Thanks for writing to us. If you are sexually active, then abnormal brown discharge needs to be concerned. Implantation bleeding should be ruled out. Do home pregnancy test to clear confusion about pregnancy. Later, you may need to undergo one blood test for beta-hCG and Trans Vaginal ultrasound scan to rule out underlying pathology or product of conception. Other reasons are endometriosis, old blood, endometrial tissue, hormonal imbalance, stress/ depression, vaginal/ pelvic infection etc. Please consult with gynecologist for complete health check up with relevant investigation. Take proper medication if required. Maintain genital hygiene. Avoid mental stress. Practice safe sex in future. Good luck.