you will never exactly know when you will get your period however there are some signs that your period is on its way . The first 's signs are growing pubic hair and having discharge which is a whitish stuff coming out of your private about 6 months after that happens you should be expecting your period however many girls a diffrent so results may vary.
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The definiton of period (T) . Is T = 1/f ; Therefore if you know that the period is 2.5
You will know because they'll be white/yellow stuff in your tidy -whities. As well as cramps so it's just like getting any period
By the way I'm nine and I know this the answer is.....739,652 it's from my homework
i really dont know !!!
If you know the time, t, taken for N (complete) oscillations then the period, P, is P = t/N