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. 
​Do you think my period is going to be late? If so, why?