I have to get one done early (in a few weeks) and then again later on because my family has a history of diabetes and I'm overweight. Had to get it done twice with my daughter too. It's not that bad really. All you do is go in to your doctors and they give you this really sweet drink, you drink it all and wait an hour then go back and they pull some blood. That's it. Nothing to be scared about, if they want you to have one done early your doctor should mention it and set up a date on your first visit, otherwise I think everyone has to get one done later on in the pregnancy, at least here in the states.