Vascepa is a prescription medication used to treat high levels of triglycerides in the blood. The active ingredient in Vascepa is icosapent ethyl [1]. According to the FDA, Vascepa is classified as a pregnancy category C drug, which means that animal reproduction studies have shown an adverse effect on the fetus, but there are no adequate and well-controlled studies in humans [2]. The FDA advises that Vascepa should only be used during pregnancy if the potential benefit justifies the potential risk to the fetus [2]. According to Drugs.com, it is not known whether Vascepa passes into breast milk or if it could harm a nursing baby [3]. Therefore, it is important for pregnant women to consult with their healthcare provider before taking Vascepa.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/VASCEPA
[2] https://www.accessdata.fda.gov/drugsatfda_docs/label/2017/202057s019lbl.pdf
[3] https://www.drugs.com/pregnancy/icosapent.html