I was really borderline with #2, my last pregnancy. I monitored my BS 4x a day and was able to keep my numbers pretty good with diet and exercise.
I relate to a lot of what has been said here. I was OBSESSIVE about it last time. I thought about my food every waking moment. In order to keep my numbers "good" I had to eat 6x a day (3 small meals/3 snacks). I hated eating that often, and constantly having to come up with hight protein/low carb options. Once I found the foods that worked for me, I stuck to them.. and man, did that get BORING. Eating lost all pleasure and just became a chore. And the few times I did indulge in a sweet or a higher carb meal, I would agonize over how high my reading might be. I obsessed over having a GIANT baby (I measured 3 to 4 cm ahead the whole pregnancy) and he was 7 lb 6 oz. I really don't want to make myself so crazy over it this time.
I plan to skip the GTT and just stick with monitoring on my own. My MW is good with that. I started off this pregnancy really strong, diet wise.. but the last few weeks I have felt so crappy and nauseous that I'm just eating whatever doesn't make me want to hurl... so I've been making a lot of bad food choices. I really need to get with the program. I've been feeling tremendously guilty by how badly I'm eating.