Both are part of going through puberty.
Your body decides when you start your period nothing else. Hormones determine when this will happen.
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.
Height has no bearing on starting your period. This is related to the development of your body and your reproductive system as to when you will start.
It is your body's way of preparing for your period. The cramping should only happen at least two or three days before you start your period. If you don't start, it may have been your body releasing an egg. The spotting, is very normal. Again, your body is preparing for your period.
Pregnancy Body response Body system
Nothing. You can't start your period. The body decides when you start. It is a combination of hormones and DNA. Be patient it will start soon enough and you will have it for 40+ years.
There hips are growing and her body shape.
There is no way to know when you will start your period when you first start taking Triphasal birth control. You just have to wait and see how your body reacts.
There really is no specific weight to start your period. It is when your body thinks your at the point when to start. Your BMI has to be around 20 thru 25. hope I helped :)
There's no rule. Some start at 11 and some girls start at 15. everyone's body is different.
No. Only hormones determine when you body has a period. What you drink or eat has nothing to do with it.
None. Hormones in your body decide that.