Lipitor, also known as atorvastatin, is a medication used to treat high cholesterol levels. However, its safety during pregnancy is a matter of concern. According to the American Pregnancy Association [3], the use of atorvastatin during pregnancy is not recommended as it may cause harm to the developing fetus. Studies have shown that the use of statins, including atorvastatin, during pregnancy may increase the risk of birth defects, such as heart and lung problems, and may also affect the growth and development of the fetus.

The University of Texas Southwestern Medical Center [2] also advises against the use of statins during pregnancy, especially during the first trimester when the fetus is developing most rapidly. They suggest that women who are planning to become pregnant or who are already pregnant should consult with their healthcare provider before taking any medication, including atorvastatin.

According to Drug Patent Watch [1], Lipitor is classified as a Pregnancy Category X drug, which means that it is contraindicated in pregnancy. This classification is based on animal studies that have shown adverse effects on the fetus, as well as the potential risks to human fetuses based on the drug's mechanism of action.

In conclusion, based on the sources provided, it is not recommended to take Lipitor during pregnancy, especially during the first trimester. Women who are pregnant or planning to become pregnant should consult with their healthcare provider before taking any medication, including atorvastatin.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://utswmed.org/medblog/statins-pregnancy-familial-hypocholesteremia/
[3] https://americanpregnancy.org/healthy-pregnancy/medication/atorvastatin-during-pregnancy/