Ralph Waldo Emerson (1803-1882), perhaps best known for his essay Self-Reliance (1841), was one of America's most influential thinkers and writers. After graduating from Harvard Divinity School, he followed nine generations of his family into the ministry but practiced for only a few years.
The first menstrual period is called  menarche .. The menstrual cycle is about four weeks long, starting on the first day of bleeding and ending when the next period begins. However, it can vary greatly when a girl first starts her period. It may skip months or come several times per month in the beginning.
A. Your first period may last from two to seven days. Then, there might be 30 to 40 days, or even longer, before you have another period. Your next period might be heavier or lighter than the first. Don't worry if you have your first period and then don't have another for four to six months.This irregularity is normal at first. Your periods should become regular within two years after you start menstruating. Some teens have a 28-day cycle; some have a 24-day cycle; others have a 30- to 34-day cycle.on't worry if you have your first period and then don't have another for four to six months. This irregularity is normal at first. Your periods should become regular within two years after you start menstruating. Some teens have a 28-day cycle; some have a 24-day cycle; others have a 30- to 34-day cycle.