Dark brown gooy discharge instead of period for 2 weeks. not pregnant. skipped period for month? is this normal? what else can it be?

It happens sometimes: Many women have occasional variation of their mucus discharge, some spotting between periods, a heavier period, a lighter period, a longer or shorter period, etc... Having one or two of these symptoms doesn’t necessarily mean there is a medical problem, but a visit to one’s primary care or Ob-Gyn doctor is a good idea if symptoms are persistent, because some discharges are from an infection.