Discouraged

I have been tracking my period for a long time. The <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> is ALWAYS accurate at predicting my periods. It always comes on the exact day. Never early or late.

Well this month was unusual. I started my period 5 days late. This has never happened to me and it’s freaking me out. I thought for sure I was pregnant. I wasn’t stressing, nothing. 🤷🏻‍♀️ my period is lighter than usual. My sister bled with her pregnancy the first month. What do I do? Should I talk with my doctor since this is so not normal for me?