Age 27, no kids. This month period was 6 days early (27days), no pain/warning, watery without clots/tissue. Never happened before. Periods usually reg.

Period aberration. Since this is not your usual "period", wait and see if this pattern continues. If it does, see a GYN MD for assessment. Sometimes Mother Nature throws in a "change of pace" with menstrual cycles, then reverts back to her regular on time arrivals..