Different parts of puberty have different names:

Pubarche is the name for attaining pubic hair.

Thelarche is the name for breast growth.

Adrenarche is the name for a time of increased hormone production.

Menarche is the name for first period.

Spermarche is the name for first ejaculation.

Gonadarche is the name for when the testicles and ovaries enlarge.

Girls' nipples typically begin to develop around the age of 8-13 years old. This stage of development, known as thelarche, is one of the first signs of puberty in females.

In general, the puberty and the menstrual cycle are genetically and hormonally determined and different girls can have different development. In different countries periods are starting at 10-17 (depending on physical development, hormones, genetics, country location, etc). It is very personal and pre-menstrual "signals" (strange discharges, breast tense, abdomen pain-so called menstrual cramps, etc.) can come 1-2 days or 2- 3 months or 11-12 months in advance. Some girls don't have any pre-menstruation "signals". It depends how sensitive are you and how fast your hormones will jump up. Just don't be stressed because stress itself could make a delay. Everything has it's time. If you would not have your cycle up to 17 - better visit your doctor.

First period usually occurs about two years after your breasts develop (thelarche) and between 4 and 6 months after the growth of your pubic and underarm hair.

Males and females make both female and male hormones. The ratio we make depends on our sex. Males make more testosterone than females and females make more estrogen than males.

When puberty starts, production of both increases with the dominant one really increasing. Because of this, when a boy starts puberty he also increases his estrogen production. In many boys (about 20%) this causes a temporary growth of breast tissue, a condition called gynecomastia. Nipples will swell, they become more sensitive, they might even get actual breast growth. Fortunately, it's temporary and usually doesn't last more than a year. When testosterone production is at its peak its ratio to estrogen is much higher and the breast symptoms go away.

It's the same reason why older women sometimes begin to grow facial hair (estrogen production drops and the ratio is closer), and men have less facial and body hair (testosterone production drops and the ratio is closer).

When you have very bad head ache , when your stomach hurts , when you back hurts , when you have growth spurts , dishcarge , borwn discharge , when your breats hurt / tender , when you are itchy *down there* only some cases though , when you are tired most of the time , when you don't pay attention as much in class , and when you have a lot of mood swings.

I hope that helped! :)