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 period is made up of blood and the womb lining. The first day of a woman's period is day one of the menstrual cycle. Periods last around three to seven days, and women lose about three to five tablespoons of blood in a period,â says Belfield. period is made up of blood and the womb lining. The first day of a woman's period is day one of the menstrual cycle. Periods last around three to seven days, and women lose about three to five tablespoons of blood in a period,â says Belfield.