App said period was suppose to start...

Alyssa • 🤍Wife💋 Momma of two 🧟‍♀️🧟‍♂️ 1 👼🏽 and currently🤰🏽🌈
And I logged it as I havent gotten my period but it still shows today as a "Period Day"..will it change by tomorrow? I know the app isn't accurate in my periods, only by a day or two though.