What is my correct DPO?

Betty • 34 ♏ | Married | TTC for 👶 #1 | Dog Mom 🐾

Looking at both my <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a> and my premom app, would you agree that me being 8 DPO today is pretty accurate? My period is expected in 6 days, not sure if/when I should test before then...I had a dream on NYE that I got a positive HCG (have never taken one before).