Pregnancy dating

Michaela

Okay so this might be a stupid question but here it goes. I’m 14 weeks today. The doctor says the baby is a week ahead of that. I have another <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">pregnancy app</a> I use so do I set it to 15 weeks since that’s what the baby is measuring or keep it on 14 weeks since that’s technically what I am?