I used medicated axe oil a lot during my 1st trimester to help ease the nausea & headaches. So far no issues. I'm on my 3rd trimester now. But avoid using medicated plaster like salon pas to paste on body. You can also see other posts asking the same questions.
I've been dabbing a few drops of axe oil on the inside of my mask when I'm out at places that I know will have smells that trigger my gag reflex. (Week 12 now)
I used ruyi oil for my both pregnancy.. used peppermint essential oil on my nostril to prevent puke as well.
I used axe brand at 1st (nausea) and 2nd trimester (headacache). So far so good.. my baby is healthy now..
I have heard from another mummy only Ruyi oil is safe for pregnancy. Avoid others.
I only apply ruyi oil and avoid using the rest like tiger palm.
I use axe oil , freshcare roll , ruyi oil