Safe essential oils

I know about young living brand, but I use DoTerra brand as it is a competitor and cheaper pricing 😬 both have well regarded oil quality and the price speaks for itself. Impt to use good quality oils as you’re breathing it in or applying on skin. I’m less adventurous during pregnancy and only use peppermint oil on my stomach or back to facilitate burps when bloated. It works. I believe tea tree is safe too. I use for pimples.