You don't know when you are going to start your period. Everyone's cycle is different. You could start at 8 or 15 it just depends on when mother nature wants it to hit and when she hits, she hits hard.
well ok it all happens with vaginal discharge witch is mucus that comes out your vagina that's when your ovary gets a message to get ready to release an egg
Girls are supposed to start between ages 9-14. When it ends, then it's a sign of you can't have anymore babies.
You usually get it in 6th grade, or middle school. Some people get it in 5th, or even 7th.
anywhere from a week to a couple of days, depends on your body
usually cramps abdominal pain back pain headaches sore breasts
If you have already started and waiting for it to happen again. They will be round about 30 days apart.
No some people just don't get underarm hair.
You would know if you're pregnant by taking a pregnancy test. A pregnancy test can be taken from two weeks after intercourse and doesn't require you to know when your period should have started.
I didnt know for sure,But i knew when it started because it feltlike i was peeing in my pants but couldn't stop.Good luck,Alex.
Well usually the doctor will tell you when your going to start it. but when you do, it usually last a month for it to start again so keep track of when you started
my period use come on now but now it not on why
you let everyone know what youre doing. tell them how your day is going and can just complain about how horrible or wonderful your life is.
And im suppose to know this why?
Climax
ok well like um... you will know when you start getting a back ache,your stomache strts to feel really hungry ,when your not,and you will get really tired...you will notice when you have blood in your underwear!!!i know girls it is ok!