Which do you go by when saying how far along you are?

Julia

Hi all! According to the <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a>, I am 9w1d. Based on an ultrasound 2 weeks ago, today I should have been 8w6d. I went today for another ultrasound and baby was now measuring 9w3d. Which of these should I go by for knowing when I enter a new week?

*Sorry if this was confusing!