In order to create an ovulation calendar, use any calendar to note the days of a menstrual period, starting with the first day of the menstrual period. Discover how a normal menstrual cycle lasts between 25 and 35 days with help from an OB/GYN in this free video on women's health. Expert: Raeph Laughingwell Contact: www.womancareobgynma.com/ Bio: Dr. Raeph Laughingwell earned his medical degree at the University of Medicine and Dentistry of New Jersey and the New Jersey Medical School. Filmmaker: Christian Munoz-Donoso