Evening Primrose? Does it work?

Cora
I'm 38+4, not dilated at all :( juuuust a soft cervix. 
I was wondering if evening primrose has worked for you all? Does it help dilate or just soften cervix?
Would it be too late to try it? Aaaaand I know there is an oil and a pill form? Which is better? 
Any advice would be appreciated ❤️☺️