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As long as a woman's short menstrual period is part of a steady pattern and fits within this range, this is normal menstruation for her body. If your period lasts for three days, month in and month out, that's your pattern, says Maria Arias, MD, a gynecologist at Atlanta Women's Specialists in Georgia.Reasons for a Short Menstrual Period. Estrogen is the all-important hormone required to create the endometrium each month.f your period lasts for three days, month in and month out, that's your pattern, says Maria Arias, MD, a gynecologist at Atlanta Women's Specialists in Georgia. Reasons for a Short Menstrual Period. Estrogen is the all-important hormone required to create the endometrium each month.
A normal menstrual cycle lasts 28 days, plus or minus seven days. Menstrual bleeding is considered irregular if it occurs more frequently than every 21 days or lasts longer than 8 days. Missed, early, or late periods are also considered signs of an irregular cycle. To determine whether your menstruation schedule is irregular, count from the last day of your previous period and stop counting on the first day of your next. Repeat this for three months.