Period dream meaning is explained below using 2 different sources. Each interpretation is shown with its source.

Interpretation 1 — myjellybean

To dream about your period indicates that you are releasing your pent-up tension and worry. It signals an end to your difficult times and the beginning of relaxation. In some cases, this dream may also mean that you are having trouble accepting your feminine side. Also, dreaming of your menstrual cycle when it is not time yet may simply be caused by your anxiety about your cycle (if you’re worried about pregnancy) or it may sometimes mean you will get an early or unexpected period.
Source: My Dream Interpretation Author: myjellybean

Interpretation 2 — Klaus Vollmar

See Rhythm, Haste, Step, Menstruation, Nosebleed.
Source: Little Giant Encyclopedia Author: Klaus Vollmar