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Getting two periods in one month may not be cause for any concern. For some, it may even be the norm. The typical menstrual cycle is 28 days, but 24- to 38-day cycles fall within the normal range.

It all starts with sperm cells and an egg. About halfway through your menstrual cycle, one mature egg leaves the ovary — called ovulation — and travels through the fallopian tube towards your uterus.