Change in EDD/39Wksd4

Hi just wanted to ask kasi I had my last ultrasound two days ago for final checking lng sabi ni doc nang amniotic fluid, weight, over all stats ni baby. Yung first two ultrasound ang sabi edd is sept 5, pero tong last na ultrasound naging sept 19 na. Hehe. Edd based on LMP ko dati is sept 5 din. Paano ba un? Gestational age ni baby is 37 weeks na per ultrasound, pero bilang namin is 39 weeks na. May nakaexperience na nang ganito din? Tia! #firstbaby #1stimemom #advicepls