What is my body trying to tell me?

Abigail • Twenty one. Still taken. Still tired.
Alright ladies, I'm stumped. I am on a typical 28 day cycle. The past year and a half my periods have been severely regular which is a blessing, all thanks to my IUD. I always get cramping before my period, as well as I get ridiculously tired. But I am a week late and feel completely normal. My fiancé and I always have unprotected sex (spare me any lectures, we have a plan) and we have for a long time. There's such a tiny chance I'm pregnant, and there's no extra stress in my life. SO WHY IS MY PERIOD LATE? 
Any ideas are welcome. 

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