What does it mean to have a regular period? July 12, 2022 19:26 Updated A regular menstrual period includes a 21-35 day gap between cycles. This means you should get your period every 21-35 days. Related articles How long should I stay on hormone balancing therapy for? What are the possible side effects of my PMS (progesterone) cream? Will I see increased hair growth when using the testosterone/testosterone plus cream? Why don’t I just see my doctor for this treatment? What are the possible side effects of my libido (only Testosterone Cream?)