Itchyness during pregnancy

Currently at 20 weeks and experiencing itchyness in my whole body, from head to toe. Itchyness is at its peak during night time nut happens also sometimes during the day. Usually it starts from my toes going up to my scalp. Its a different kind of itchyness as its like “tumutusok” after scratching also my skin it will have “pantal” but after less than an hour or so it will vanish. Im not allergic also to any kind of foods before pregnancy.