Yes, if you have a history of gestational diabetes (GDM) you are at an increased risk of developing GDM in subsequent pregnancies. Research has reported recurrence rates between 35% to 70%. You are more likely to have GDM in your next pregnancy if you are heavier (even only 20lbs or 10kg heavier) and wait longer between pregnancies.
At this time it is not clear if medication interventions after a pregnancy complicated by GDM will prevent recurrence, but there is some evidence that anti-diabetic medications which increase insulin sensitivity may reduce the risk of GDM in women with polycystic ovary syndrome (PCOS, which is a risk factor for GDM) by up to 10 fold.
In general, life-style changes such as increasing your physical activity, eating a healthy diet and reducing your weight (if you are overweight or obese) is the minimum you should be thinking of doing, regardless of whether you are contemplating having another child or not. This is because women with a history of GDM are exposed to a higher long-term risk for developing metabolic syndrome and type-2 diabetes.
*Reece EA, Leguizaman G, Wiznitzer A. Gestational diabetes: the need for a common ground. The Lancet. 2009;373(9677):1789-97.
*Bottalico JN. Recurrent Gestational Diabetes: Risk Factors, Diagnosis, Management, and Implications. Seminars in Perinatology. 2007;31(3):176-84.
*Holmes HJ, Lo JY, McIntire DD, Casey BM. Prediction of diabetes recurrence in women with class A(Diet-Treated) gestational diabetes. American Journal of Perinatology.27(1):47-52.
*Moore LE. Recurrent Risk of Adverse Pregnancy Outcome. Obstetrics and Gynecology Clinics of North America. 35(3):459-471