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

yes get it checked out at your doctor's, it could just be from the skin stretching or it can be a sign of obstetric cholestasis. FYI some links from government websites in Australia and UK. https://www.pregnancybirthbaby.org.au/itching-during-pregnancy https://www.nhs.uk/pregnancy/related-conditions/complications/itching-and-intrahepatic-cholestasis/