Evening Primrose Oil

Alanna
Went to the dr today and I'm currently 34 weeks and I'm doing a VBAC. My midwife suggested using evening primrose oil to help soften my cervix and to start spontaneous labor as she put it! With our son he came on his due date but I ended up having a c section with him. I've never taken this before. Has anyone taken this and it not cause problems? Please let me know!! Thank you!!!!