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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.
1 Age. 2  When teens first start having periods, their menstrual cycles may not always be on the same schedule every month. 3  It may take several years to settle into a pattern. 4  In addition, missed periods and lighter or heavier periods are common as women near menopause. 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.