Best to go for checkup in the morning or avoid high intakes of sugar or carb on the checkup day.

My wife never faced this problem before because we went for Saturday morning checkup with empty stomach. Due to long wait (sometimes), I suggested for workday afternoon checkup and that was my biggest mistakes. After she got diagnosed with high glucose level in her urine, gynae kept bugging and we even had to meet diet doctor. Had to take test everyday after meals. After few times, we finally got used to it and just fake the record. It's impossible to get healthy glucose level if you're eating healthily especially in the final few weeks when the baby is growing at the fastest speed. It went away after the pregnancy like many others reported online.