H.F.
As a borderline diabetic, you are more at risk of developing gestational diabetes. This can me higher risks for a few different problems in pregnancy but as long as you watch your diet, exercise regularly, and monitor your blood sugars you should be just fine.
With both of my pregnancies, I was able to control my sugars through diet. I didn't need to take any insulin. This would depend on your body and your diet. If you are able to control your sugars through diet, then they will monitor your pregnancy a little closer. You may have a few more sonograms than a mother who does not have any sugar problems. This is to monitor the babies growth. If your sugar levels are too high, then the baby will tend to grow in size a little faster. This increase in size of the baby can also correspond to problems with the lungs not developing as quickly as they should. This is why it is so important to monitor your sugar levels and keep them on target.
If you are unable to control your sugar levels through diet, you may have to give yourself insulin injections. Your doctor can tell you more about this. Don't be afraid to ask.
At the end of your pregnancy, they may want to induce labor if the baby seems to be getting too big (as I mentioned one of the things that can happen with diabetics). The important thing to do now is take a deep breath and relax. Your doctors will monitor you throughout the pregnancy. There is a multitude of resources available out there for those with diabetes and gestational diabetes.
Although you will need closer monitoring as a borderline diabetic, diabetics have healthy babies everyday. My friend has had 3. I've had 2. You can, too.