My OH refused her fasting glucose test the last pregnacy, she tested borderline on the pregnacy before.
She got a cheapo blood glucose machine and monitored her own levels and there was never a problem apart from it dropping a bit low on a couple of occasions, that was pre-primal, but we were on slimming world diet so no very little refined sugar, but lots of whole wheat pasta.
I honestly think it is a pointless test if you don't consume vast amounts of sugar, and GD is contraversial as to wether it really exists anyway. My OH did a vast amount of research and concluded that there was very little evidence, and what there was was poor, so really just monitored to keep the midwife happy.
You know all those pictures of Adam and Eve where they have belly button? Think about it..................... take as long as you need........................