Hello doc. i missed my period for about a week i just recently got it but its extremely lightand its brown i took a pregnancy test but it was negative?

Irregular Menses: It is common for young women to miss periods, or have them come late, especially with excessive stress, weight loss, or exercise. If you did not ovulate (release an egg in the middle of your menstrual cycle) your period can be very light or not come at all. It may be heavier the following month. Brownish spotting is from old, dried blood.