I've been lurking for a while, but this is my first post. I'm in my second pregnancy with GD, first time diagnosed at 28 weeks and controlled with diet, this time round I've been testing from the start and currently still diet controlled at 19 weeks.
There have been a couple of comments about testing intervals further up the thread... In my experience the focus has always been on 1 hour after meals, with my diabetes antenatal team (and it is a team, usually see at least 8 people at consultations!) only wanting an occasional 2 hour reading from time to time, also have to test first thing. I think I recall being told first time round that this was because for GD they are particularly concerned about spikes in BG as it's hard for the baby to deal with the fluctuations. My targets are 4.0 - 5.6 first thing, 4.0 - 8.0 1 hour after meals and 4.0 - 7.0 after 2 hours. I frequently go lower than 4.0 but have been told that's fine it's the upper bound they worry about.
I have also found my readings can be pretty random from 1 day to the next, I think this is because the level of pregnancy hormones impact the insulin resistance, it generally gets harder to control BG levels as the pregnancy progresses too.
I tend to follow a restricted carb diet, along the lines outlined a few posts down. This pregnancy I've been gradually cutting the carbs down as my BG levels start to go up. It is a pain, particularly when combined with other pregnancy food restrictions (although I generally ignore the majority of those!), but it's only for a short time and last time the post birth pizza and champagne was the best meal I've ever eaten!
Good luck with your pregnancy.