Tina Otte answers:
There are many aromatherapy essential oils that are safe to use during pregnancy. I would suggest not using any essential oils until after 12 weeks. I would suggest you only use lavender, geranium, patchouli, sandalwood, neroli, lime and mandarin- these oils are safe to use during pregnancy.
Oils are absorbed more through the skin than through breathing, so wearing a mask is not going to make a difference. I am more concerned about the oils getting into your system via the skin. Wearing gloves is not really an option with true essential oils as they eat through the latex.
I strongly suggest that you contact the manufacturers and ask them if they are safe to use during pregnancy. I cannot advise on the botanical mixtures as I have not worked with them, and you do not mention what is in the product you are using.
Good luck and stay safe and healthy!