Did you know that there is a very accurate way to predict when your period will start? You can know for sure, about two weeks in advance. How? Well, it's all thanks to a fixed number of days in your cycle called your luteal phase. But, you might say, "My cycle is never the same length--it's different every month, and I never know when 'Aunt Flow' is coming for a visit!" If you think that, think again, because I'm going to let you in on a little secret that shouldn't be a secret, but should be taught to every 13-year-old girl.
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