why is my period always so late??

My period has ALWAYS been out of wack. But it's getting ridiculous! My cycles really shouldn't be 35-40 days long...my friend's cycles are all around 28 days! Why isn't mine? And I know stressing out about it causes it to stay in hiding even more. And it doesn't help that my boyfriend and I had sex last thursday and saturday - and yes, we used a condom, and no, it didn't break. So I'm pretty certain I'm not pregnant, but my period still isn't here yet and I'm so over it. (Today is day 37 of my cycle...) I really would just like some peace of mind. 

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