1.Dilute, Dilute, Dilute: Because essential oils are concentrated they will need to be diluted before they are used. For pregnant women, dilutions for essential oil blends should stand at 2%. This means that one should use 10 drops of oil in 2 TBS of carrier oil. For a bath, using 5-10 drops of essential oil should be safe.
2.Avoid These Essential Oils: There are certain essential oils that should be avoided while one is pregnant. During the first 3 months of pregnancy, essential oils should be completely eliminated. Afterwards, you may begin to use essential oils, just be sure to dilute them and to avoid certain ones all together. Some of those that you should avoid are lemongrass, parsley, peppermint, thype, basil, cinnamon, clary sage, cypress, jasmine, clove and myrhh.