Pregnancy is a very stressful situation for every woman, and for her body. Lots of changes start to occur to prepare the mother’s body and to supply of nutrients and elements the new fetus and help with his development and growth. Biochemistry, physiology, and endocrine changes and disorders could happen since the beginning of the pregnancy up to the end; some of them will be auto-regulated for the own body, but other will lead to diseases or conditions such as hypothyroidism.