Clary Sage Oil

Has anyone had any success inducing labour with clary sage oil? How was it? How long did it take? I've just had a bath with clary sage oil but then googled afterwards! I think I probably put a bit too much in as apparently only a couple of drops is recommended. I've also read you shouldn't use if you're trying for a vbac (which I am) as it can cause stronger uterine contractions. Any advice/experience?