Today is supposed to be the start of my period

Stacie • Mother to Ben 👦, Bash 👦, and Braxton 👶, 420 enthusiast 🍁🔥💨, lover of life 😍✌
Well, as the title says, today is supposed to be the start of my period. I haven't had any symptoms that I usually have before my period and I know for a fact I'm not pregnant. 
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​Do you think my period is going to be late? If so, why?