I am in my second trimester and lately I have developed a craving for smelling chalk? Is it normal?

Don’t panic; it happens and is not abnormal. It seems that you have Pica disorder. Pica is a eating disorder of craving substances with little or no nutritional value. Pica cravings are sometimes the body’s attempt to obtain vitamins or minerals that are missing through normal food consumption. Monitor your iron status along with other vitamin and mineral intake. Please inform your health gynaecologist and seek advice.