Hi, i missed my period, due 3 weeks ago, ever since i've been spotting brown/light blood, i'm not sexually active and have been under stress?

Missed period: This presentation sounds like you had an anovulatory cycle where you the egg was not released from the ovary, however the uterine lining, waiting for it has just been dripping down over the last three weeks. If this continues, see your health care provider. Stress, weight loss, illness thyroid problems can all cause irregular or missed periods. If you have not been sexually active, your safe!