Castor Oil?

No negative comments please, I've done my research and I'm still in the decision making phase. However I am considering so please spare the negative facts.... I'm 37 weeks, not dilated, but baby is fully engaged and in the birthing canal. If I was to take castor oil, do you ladies think it would kick things into gear? I'm debating on waiting until 38 weeks IF I DO so that I atleast progress some