Throughout a monthly menstrual cycle, your body makes different amounts of chemicals called hormones to prepare for pregnancy. For the first few years after menstruation begins, long cycles are common. It usually happens once every month. Jan 8, 2026 · Here are facts that teen girls should know about having periods, including how long first periods last and answers to other general questions. Phase 1: Menstrual phase. It may look like a lot of blood, but a girl usually only loses a few tablespoons of blood during the whole period. Jan 11, 2026 · Menstruation (or period) happens monthly. However, it can vary greatly when girls first starts their period. Sep 4, 2025 · Menstruation is period bleeding, which is casually referred to as “having your period. 1 This usually occurs once a month if you are not pregnant and Your menstrual cycle begins on the first day of your period.

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