Just tested positive for GD at W28 but had no advice yet from TMC

I just tested positive for GD yesterday, the gynae said I can probably control my diet and don't have to take insulin, and that someone will call me to advise about the routine. No one's reached out yet, and I haven't been given anything to prick myself with. Are there any strict no no's to be aware of? Any harm still eating 1 snack a day if I cut down on carbs during meals? I just received a huge box of cookies and cupcakes and tau sar pia and ice cream, I'm hungry, it's the weekend, and all these snacks are going to go bad. #GestationalDiabetes #pregnancy #advicepls