My daughter was born via induction to emergency c section at 37+2
What brand are you using? If pure grade 100% natural oils (no synthetics) it’ll defiantly be safe to use.
It’s definitely safe if using natural oil. I started to use in roller and diffuser around 39w, I went to 42+2 and I drank the teas, did the exercises and did the oils , it all depends on your own body
I used it from 35ish weeks, I only put it on a cloth and smelled it but it didn’t do anything