is there any redness appearing on your skin?? it might be allergies reaction if you have.
but if skin appear normal no redness, maybe your skin is dry and because we put on weight the skin got strech and can cause itchness.
which part of your body that's itchy??
mine is itchy on legs and thigh area, i noticed my legs skin became super dry since 2nd trimester, can't sleep w/o applying moisturizer.