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The first day of a womans menstrual cycle is also the first day of menstruation.
The menstrual cycle begins with day 1 which is the first day of bleeding. The last day of the cycle is the day before the next period begins.
Day one of the menstrual cycle is THE DAY YOU START BLEEDING, THE DAY YOU START GETTING YOUR MENSTRUAL FLOW. This is the day you start counting your cycle, until you get the first day of the next period, this is, that is the fist day of that new cycle. DO NOT start counting from the last day of your period, that is a common mistake. It is important when you visit a physician to know when was your last menstrual period, so try and keep record of it in some form of agenda or excel page. When a doctor asks, "when was your last menstrual period?" he or she will count on you to remember this date, it is important health information and you should be responsible to remember it. He or she are expecting to hear the date of the FIRST DAY of your last, and therefore, most recent menstrual period. I'm a general physician, so, I'm telling you, for us, this is important.
The first day of your current menstrual cycle (the first day you begin to bleed again) is also your last day of your previous cycle. The average length of the cycle is 28 days. The first day of your current menstrual cycle (the first day you begin to bleed again) is also your last day of your previous cycle. The average length of the cycle is 28 days.
To calculate an estimated due date you should count from the very first day (the day you started bleeding) of your last menstrual period.