Some oils are not safe to inhale or use while pregnant like eucalyptus and Clary Sage, citronella and also jasmine. Lavender is also not recommended until late pregnancy (after 37 weeks) same with pure cinnamon oil. Bergamot is a great scent to use and of course you can use peppermint and vanilla. Here's a link for more info.

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Don't worry about diffusing. The oils that are somewhat "dangerous" most people don't use anyway.

I got one for Christmas as well but never used them so I'm interested in your post too. What scents are used?

@mrs.schmalz