Frustrated!

First pregnancy here and diagnosed with GD. I love sweets, but have been super disciplined about cutting out added sugar and carbs and eating a lot of protein since being diagnosed. My blood sugar numbers have been in check, but my mood just is awful most days. I have not had a meeting with a diabetes educator since being diagnosed almost a month ago and my appointment isn’t for another 2 weeks (someone quit and they just have one RN at the moment). I had a urinalysis yesterday for a suspected uti and my urine glucose was 300 mg/dL?! I was very confused because I cannot figure out why my kidneys would be dumping that much sugar in my urine if my blood sugar numbers are controlled. I asked my doctor, and he did not have an answer for me. I know this is a new pregnancy issue as this was not an issue at the start of my pregnancy because I have had plenty of urinalysis readings in the past. Thoughts? Anyone else with a similar experience.