36 week appt gestational diabetes

Leanne • MC 2017, MC 2018, MC2019, septate uterus removal, DS 2020, bfp Feb 2023

Hi ladies, had my 36 week growth scan today and baby is plotting at the 97th percentile.

They did bloods for GD, I’ve been having fortnightly urine checks - glucose included. Could GD have been missed in urine for all this time? Does GD always show in urine test or is blood test more accurate?