Menstrual cycle - women' health issues - merck manuals, By definition, the menstrual cycle begins with the first day of bleeding, which is counted as day 1. the cycle ends just before the next menstrual period. menstrual cycles normally range from about 25 to 36 days. only 10 to 15% of women have cycles that are exactly 28 days..

Menstrual cycle: ' normal, ' - mayo clinic, The menstrual cycle, counted day period day , woman. menstrual flow occur 21 35 days days. years menstruation begins, long cycles common.. http://www.mayoclinic.org/healthy-lifestyle/womens-health/in-depth/menstrual-cycle/art-20047186 Menstruation (menstrual cycle) - medicinenet, A cycle counted day 1 period day period. average menstrual cycle 28 days long. cycles range 21 35 days adults 21 45 days young teens.. https://www.medicinenet.com/menstruation/article.htm Understand female menstrual cycle, ovulation periods, The day menstrual cycle day period (day 1). period lasts 3 7 days. ’ll find period pains, ’ll worst days period.. http://uk.clearblue.com/menstrual-cycles-and-ovulation