The entire menstrual cycle for a human lasts from the beginning of menstruation to the beginning of the next menstruation. Generally around 28 days.
The term for the onset of a woman's monthly menstrual flow is menses. The term for the first period in a girl is menarche.
The menstrual cycle starts on day one of menstruation, on average menstruation lasts between 5-7 days. Thus between days 1-6 of the menstrual cycle you're menstruating.
when she starts menstruating
Before or during puberty.
The menstrual cycle starts with menstruation. The firswt day of your menstrual cycle is considered to be the first day of true bleeding during your menstrual phase.
luteinizing hormone
Generally, there are 28 days between menstrual periods. This can vary, however, especially if one has not been menstruating for many years. From personal experience I can say that even after eight years one's period might not be very predictable.
She is beginning her monthly period.
A girl can become pregnant with a baby as soon as she starts menstruating. This usually begins when the girl goes into puberty.
The 4 phases of menstrual cycle are Menstrual phase, Follicular phase, Ovulation phase and Luteal phase. Menstrual cycle day count starts on the first day of menstruation when blood begins to leak out of the vagina.
Your menstrual cycle starts by itself when it is ready to do so, as long as you're healthy it will start by itself. There's no reason for you to try to do something to start your menstrual cycle again.
The arctic circle