I am in my second trimester and I keep scratching my body all day. What's happening? Is this normal?

If there’s visible rash mark, especially on your belly and spreading to whole body (except for face), this could be PUPP. If there’s no rash at all, the itching worsen at night time, and especially your palm and sole are very itchy, it could be Cholestasis. Blood test is needed to confirm it. Both needs to be reported to your gynae, he would prescribed meds for it and manage your condition.