According to this app, i'm at week 9 day 6. But why the doctor said i'm at week 10 coming 11? Hmm..

Your EDD can change as your pregnancy progress as it is estimated based on the size of your baby. It will be more accurate after 20 weeks so follow your gynae’s EDD. :)

App is not accurate. Mine was also not accurate. Doctor’s dating are more accurate and it will also change 1-2 times based on baby’s size

The more accurate EDD will be known during week 20 detailed scan. Doc will then follow the EDD all the way.

App is based on the EDD you keyed, gynae based on baby’s size on the ultrasound scan.