Drinking energy drinks during pregnancy isn’t a strict no, but it depends on the brand.
The most important consideration is the caffeine content. Check the product packaging on your drink of choice to ensure that it doesn't contain more than 200-300 milligrams of caffeine (the recommended limit during pregnancy),
Also, try to remember that the simpler the ingredient list, the better. Artificial sweeteners and herbal additives are common ingredients in energy drinks that you should watch out for. Because many energy drinks are likely to contain an additive of some kind, it might be easiest to just avoid them altogether. Because of the lack of research into the safety of sugar-free sweeteners and herbal food additives during pregnancy, it's best to avoid them altogether.