Hello, 2 weeks late period with dark brown discharge may sometimes indicate sign of miscarriage or old endometrial tissue with co-existence of vaginal infection / hormonal imbalance. Here, you should undergo one blood test for beta HCG & repeat the TVS scan again to confirm/ exclude product of conception at the earliest. In exclusion of pregnancy, other relevant investigations like complete hormone assay, blood sugar, vaginal swab test, endometrial biopsy etc are needed to be carried out. For this, you can consult with gynecologist for next line of management. Avoid stress, take healthy diet with more vegetables/fruits, drink more water, keep bowel habit regular, maintain genital hygiene, control body wt and take sound sleep. For direct consultation with me, you may visit my profile on http://www.healthcaremagic.com/doctors/dr-soumen-patra/63326. Here, you can upload image for more suggestion. Be well & take care.