Most itching in pregnancy is related to dry skin. A good lotion can go a long way to reducing or eliminating itching related to this problem. In some cases, itching confined to one area may be related to a reaction to something, for what is called a contact dermatitis. If you suspect this is the case, try to avoid whatever you came into contact with a consider using an antihistamine or over the counter steroid cream until you are better.
In rare cases, itching all over the body that is not associated with a rash can be due to intrahepatic cholestasis of pregnancy or ICP. ICP is an important diagnosis to not miss and your doctor may need to check some labs to make sure you don’t have this. If you do, she will prescribe medicine to improve the situation and she will likely deliver you a couple of weeks earlier than normal.