Artificial sweeteners, for the most part, are safe during pregnancy but some of them should be avoided. Before consuming any artificial sweetener, you should consult with your doctor before taking. Saccharin or Sweet-N-Low, Cyclamate and a few others are not considered to be safe during pregnancy, and should be avoided. Cyclamate has been linked to causing cancer in rats and is currently banned from use in the United States.
Sweet-N-Low is not banned and found on many market store shelves today. It contains saccharin which has also been linked to cancers including bladder cancer and other problems. It is best to avoid this kind of sweetener at all costs because it is not safe whether you are pregnant or not.
If there is any question, check with your doctor to make sure that the artificial sweeteners you are taking are safe during pregnancy. Avoid the ones that aren’t and you should be just fine.