Im confussed

Taylor

How many days are in a week when ur pregnant? I mean i know there are 7 but i have 2 <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">pregnancy tracker</a> week by week one says im 9 weeks and 1 day but another says im 8 weeks and 6 days....which do i trust? Am i 8 or 9 weeks pregnant?.......mt flow tracker says ill be 9 weeks and 1 day this thur.