Gestational Diabetes

I’m 34 weeks pregnant and I was diagnosed with gestational diabetes at 28 weeks. I had my sugar levels under control till last week, this past 2 weeks I’ve had the highest at 145-170. I don’t know what I’m doing wrong I’ve being eating mostly chicken and veggies and drinking lots of water. Does anyone what can happen if I do t get it under control again? I spoke to my Dr but he’s blaming me for it so I’m not comfortable talking to him about how I feel😭😭