Tea tree oil when pregnant?

So this is kinda random but I’m currently 9 weeks pregnant and the past few weeks I’ve been having the WORST psoriasis flare up I’ve ever had. It’s all over my body from head to toe and really painful and the itchiness is unbearable. I’ve been to my doctor a few times and they can’t give me my normal cream as it’s not safe to use when pregnant, so instead they gave me a body wash which is not helping in the slightest. A friend told me to use teatree oil, a few drops in the bath or a couple drop in my moisturiser but I’m reading conflicting things online about using while pregnant, I can’t speak to my doctor until the end of the week and I’m wondering if anyone knows if I’m okay to use it?