mensturation is anoter name for period. A girl gets their period about once a month and the first day they get their period is the first day of a girls menstruation cycle or mostly known as a period cycle.
Menstruation comes periodically. That is why it is called as period.
If you have normal menstruation you cannot be pregnant.
When people say "period," it is often used to emphasize that something is final or non-negotiable, similar to saying "end of discussion" or "that's final." It is a way to assert a strong statement or opinion with conviction.
If you haven't got your menstruation at 17-18 you should go see a doctor. Up til then it's normal.
menopausal
menopausal
This beginning time is called menarche.
Ugly-Condom-Lady-Armpit-Monkey-Ovulation-Menstruation
Menstrual cycle refers to the entire reproductive cycle, starting during menstruation - there is no 'after the menstrual cycle' but I think you might mean after menstruation. After menstruation the cycle starts again, typically a woman will be fertile around a week after menstruation so her body will produce fertile cervical mucus and she will ovulate.
Green blood in menstruation can mean a number of things like cancer, a sexually transmitted disease, or fibroids. To be sure of what it is it would need to be checked out by a doctor.
Ugly-Condom-Lady-Armpit-Monkey-Ovulation-Menstruation
If you've ruled out normal menstruation see your md