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Summary: The best way to predict a menstrual cycle is by noting the days of a menstrual period on a calendar, starting with the first day of the period. Look for a pattern in menstrual cycles over a period of several months with help from an OB/GYN in this free video on women's health.
Dr. Raeph Laughingwell earned his medical degree at the University of Medicine and Dentistry of New Jersey and the New Jersey Medical School. He completed his residency training in...read more
"In order to predict your menstrual cycle, the best way to do this is to, on a calendar, note the days of your menstrual period, and you should start with the first day of your menstrual period, so simply write down on that date, the day it starts, and continue for whatever number of days your menstrual period lasts, and then, when your next period comes, again, continue that process.You should do this for several months. Over these months, you'll notice a pattern, or hopefully you will notice a pattern. If you do, you simply count the days, from the first day of one period to the next, and that's how long your cycle is, and that was generally how the best way to predict your cycle. Remember, when you're younger, in your teens and twenties, it's normal to have longer cycles. In your thirties, they tend to be a little bit shorter, and once your reach mid forties and beyond, they again tend to become longer. The normal range of a menstrual cycle is anywhere from twenty five to thirty five days. In addition to writing down the days that you have your menstrual period, other ways that you can try to predict your cycle, is to use signs or clues that your body gives you. They're called moliminal signs. Some women experience cramping, leading up to their period, some women experience some slight mood changes. All these are signs that perhaps your period is coming, and can be somewhat predictable. In the end, they're probably not as reliable as actually writing down on the calendar, the days when you have your period, and then extrapolate from that, when your next period will be."
eHow Article: How to Predict Your Menstrual Cycle