*Not another one of THOSE posts*

I see an abundance of "I'm late am I pregnant" posts. This is not one of them. I am a 17 year old who knows that taking a test is the only way to know if I am pregnant. So that's not what my question is. I was supposed to have my period on March 20th. It's the 29th and all I've had was mild cramps here and there. Should I be concerned about being 9 days late? 

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