Years ago when we were pregnant with our daughter my wife developed gestational diabetes. It was weird because we were very health conscious (or so we thought). We exercised and had a balanced diet (ripe with meat and other animal products). Not to turn this into a vegan thing but the animal products were absolutely destroying our bodies and minds.
It took us over 5 years to really be rid of all the excess sugars. We still use agave occasionally, but for the most part we're ADDED sugar-free. The main places you'll find added sugars are in drinks (the biggest things) and of course sweet pastries and candies. Eliminating sodas and juices and replacing them with water, and finding vegan, low to no added sugar snack alternatives can reverse gestational diabetes quickly.
For us it was getting rid of the juice, and we're talking all natural, fresh squeezed orange juice! Anyway, just posting to see if anyone else here has had similar issues. We've created a course to help mom's reverse this disease during their pregnancy in as little as 1 week.
You can learn more about our journey and pick up the course here: https://gestationaldiabetes.online