Gestation diabetes.. Help plz..!n

I am running into 29 weeks and my gtt came out be 189 first hour and 169 second told me that I have gestation diabetes and have to monitor my sugar after every meal. I am eating healthy mostly veggies and fruits and also taking 70 min walk daily to regulate my insulin level. I heard that diabetes can hurt my baby . even if eat healthy my sugar level goes to 160-180. What extra I can do apart from taking insulin to control my sugar level ? HbA1c is however normal.plz suggest..