Gestational Diabetes at wk 28

Just to check if any mums with GD experience with this? I am trying to check my blood sugar daily. But out of 3 meals a day usually will have one meal that slightly exceeds 6.5 (max range after food, taken 2hrs after meal). Is reading 6.8-7.0 for that exceeding meal bad for baby development? I’m trying hard and is very hungry but I still have problem getting every meal below 6.5… Please help..