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

I have found that showering/bathing in extreme hot water tends to dry skin. Maybe also try changing the soap you use. Sometimes it dries out the skin. Dehydration can also be a sign of skin irritation and dry patches. When your skin is dehydrated it creates more oil to make up for the missing water. This can cause breakouts, irritation and dry patches.