Just as for babies, there are also essential oils that are safe for pregnancy, but some are not. The scent of some essential oils help to  treat nausea during pregnancy, such as Grapefruit, Peppermint, and Lavender. Some that we recommend not to use when you are pregnant are Clary Sage, Tansy, Hyssop, Fennel, Wintergreen, and Sage, including the essential oil blend that contains these essential oils. We always recommend you to consult with your gynecologist before using essential oils.