Im lost

HELLO MY <a href="https://play.google.com/store/apps/details?id=com.glow.android">GLOW APP</a> SAY MY PERIOD IS DUE SEP23 BUT THIS MORNING I WAS SPOTTING PINKISH N NOW IT GOT ALIL MORE DARKER I DNT KNW IF ITS MY IMPLANTATION OR MAYBE MY PERIOD COMING ALIL TO EARLY WHAT SHOULD I DO