Ava app shows a week further in pregnancy

Ta

Does anyone who uses Ava find that the app tracks there pregnancy progress a week ahead from other apps? Ava says tomorrow I am on week 6 when <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">Nurture</a>, the Bump, and What to Expect all say week 5. This was all going off from my last period that was December 26, 2018. Just curious if anyone else noticed an off week.

My guess is Ava calculated days 1-6 as week 1, while the other apps suggest you reached week 1 after those days.