I'm not pregnant but I have had two back to back GD pregnancies in 2 years. First diet controlled, second dx at 5 weeks and insulin dependent by 20 weeks. I have done a lot of research and trial and error! I hope I'm not annoying but:
The GD fb page is a bit twee but actually the advice is vastly better than NHS current practice which is aimed more towards standard T2. GD needs lower readings for babies safety. NHS advice works reasonably well to start with but GD is very progressive and their diet will lead to quicker medication if you are trying to avoid that.
High fat low carb / complex carbs is absolutely the way to try and keep it down. I lost a tonne of weight doing that until I could no longer control my fasting levels, at which point I needed slow release insulin. Fasting is not really something you can control with diet. Once that happens you do need a bit more carb which is less helpful for weight loss. The best thing is fat/protein combining with your starch - never eat a naked carb. So a sour apple, but with peanut butter, or 40g brown pasta, with lots of cheesy bolognaise.
The not eating thing is no good, @Bubbles1st I'm afraid to say. Once you go past a certain point, your body will do a panic glucose dump and send your levels shooting up which is not helpful! Little and often. I worked with 3 small meals, 3 or 4 snacks and sometimes a midnight snack. Oatcakes and cheese, chorizo and a tomato, nuts and apple.
Also, spikes! Be aware that some sugary / carby things spike your bloods fat quicker than the hours test. So a Muller lite would at an hour give me a 5.5, but at 30 mins a 10.5. Doesn't matter when that spike happens, it's just as bad for baby so it's worth checking if it's low fat / high carb etc.
My boys were both lovely weights, and my diabetes went straight after birth. Insulin wasn't as bad as I thought although by the end with DS2 I was on mega high doses of slow and quick release and maximum metformin, which is not kind on sensitive stomachs, so better avoided! I also couldn't even eat a tomato or new potato even on heavy meds, so do remember to keep checking as it does get worse. Good luck!