If you have never had your period before, than your period will start when your body is ready. That is proberly why some of yoour school mates (assumed) start at different times.
The hormonal change that triggers the start of menstruation is an increase in estrogen levels in the body.
a catalyst
the hormone FSH ( Follice Stimulating Hormone) triggers the menses (period) in a healthy female. During the menses, the uterine lining is being shed.
The point of Evolution is that it doesn't start or stop at any given point. It's a natural process that happens throughout life. Evolution is caused by triggers in genes. Different animals have different triggers. These triggers can be caused by different things, but most commenly a change in habitat.
You can start conceiving from your first period.
Your period will start within 7 days
You can start them whenever, but it is a possibility that your period will be delayed.
U Have To Press Both The Triggers Ant The Start And Select Buttons Simoltaniusly on the start scren its SUPER hard
you start your period when you are 8-16 year old... BE PREPARED!!
It is perfectly normal to start your period weeks early and its dark brown. You mostly start with dark brown when you start your period and it turns red.
Your cycle is from the start of your period to the start of your period. (have alook it the lik below)
A sugar pill is what women take to start their period. It allows the period to start.