Essential Oils

Rosie • Can't wait to be married to my King 💍👰🏼 December baby on board 💗💙☺️
Hey Ladies! 
Hope all is well! 
Just a quick one... 
Anyone know of any good relaxing essential oils for safe during pregnancy
I'm practicing Hypnobirthing for my birth and would like a "trigger" smell to take me deeper into relaxation while I'm in labour. 
I have heard Rose is amazing when your actually in labour so I don't mind giving that a go but it's not safe beforehand is that right? 
So what would you suggest or have any of you used essential oils to relax with during pregnancy
I'm 31 Weeks 3 days!   
Thanks in advance girlies! ❤️