Preparing for Labor

I’m scheduled to be induced at 37 weeks due to medical reasons. I was induced at 37 weeks my last pregnancy and labored for 2.5 days.

I want to avoid a long labor by all safe means possible.

When would you recommend I start taking evening primrose oil and raspberry leaf tea?

Are there any other natural remedies I can start to help prepare my body for labor?

(I’m currently 31 weeks)