The WHITE discharge can be normal as it is your body's way of keeping an infection out (Yellow can mean infection). However itching may mean there is a small infection for example thrush. This is not a means to worry as it is easy to treat especially if it is caught fast and is very common. How long have you had this? I suggest you ask your doctor as you are pregnant so i wouldnt suggest just getting over the counter remedies. I am sure that it is nothing to be worried about. Hope all goes well!