App difference with dr counts

hi mummies , I would like to know if there is a difference of dr counting weeks of pregnancy and the app is usually different ? If as follow what my dr say , I will be at 34 weeks tmrw however my app shows me that I will be 35 weeks tomorrow. And my due date by app is 18 Dec instead of 24 Dec as mention by the dr . The app count by my last first day of period.

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Based on my LMP I just checked my EDD based on Dr is 4 days earlier than one estimated using LMP. Did you doc say anything when you asked?

12mo trước

He did mentioned the difference are just by days . But it’s about the same ☺️

App counts by LMP while the date on scans is based on baby’s growth.