You will know! Trust me! If you have cramps and backaches this can be a sign. It's not always the case though. If you have itching in your female area this can also be a sign. But again, not always the case. Also if your breasts swell, this can also be a sign. Always keep some pads. Pads are better than Tampons in my opinion.
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You will know when your period starts, because you will have blood coming from you vagina.
my period use come on now but now it not on why
If a girl has her period it all she is not pregnant. Irregularities in when the girl starts her period are a natural phenomena. the only way to control is, is by using the anticonception pill, but "the girl" has to see her doctor about that.
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!
I know any gradual change over a long period of time is evolution