Although some oils are listed asabortifacientoils, it is mainly due to theirtoxicnature, and should in any case not be used in aromatherapy massage at any time.
Some essential oils are however not toxic, but haveemmenagogueaction, which is to help to promote and regulate the menstrual flow (periods), and should be avoided during pregnancy.
Here is a list of essential oils to AVOID during pregnancy:
Almond - bitter
Aniseed
Anethole rich
Angelica
Basil
Birch
Black pepper
Boldo leaf
Buchu
Calamus
Toxic
Camphor
Cassia
Cedarwood
Chamomile
Cinnamon
Clary sage
Clove
Elecampane
Fennel
Fir
Ginger
Horseradish
Hyssop
Jaborandi leaf
Jasmine
Juniper
Lemon
Lemongrass
Marjoram
Melissa
Mugwort
Mustard
Myrrh
Nutmeg
Oregano
Parsley seed
Pennyroyal
Peppermint
Pine
Rose
Rosemary
Rue
Sage
Sassafras
Savin
Savory
Southernwood
Stinging nettle
Tansy
Thuja
Thyme both Red and Linalol)
Wintergreen
Wormseed
Wormwood
-I'm researching this list because I'm not sure if the source is credible, but it's a starting point. If you have input awesome, fill me in
found where the person who i got it from found it http://www.essentialoils.co.za/pregnancy.htm
updated by @ixchel: 02/14/15 03:26:33AM