Glow always predicted the day of my period

Morgan • Trying to Conceive 💕
Anyways so here we go. Glow has been spot on basically when all my periods would be until today. I've been waiting for cramps or some blood.. And nothing . I am way to nervous to test and I know I should. But what I'm asking you
Guys is has glow always predicted the day of your period then you never got it that day and ended up pregnant?