Pumping before baby comes

Kaye • OB/L&D TECH. Second girl due in November. Hoping for a vbac

My doctor said I could pump after 38 weeks in hopes it could cause me to at least dilate (having a vbac). So I tried. And actually got colostrum ! I was shocked. But it didn’t cause me to have any contractions or anything. Is it supposed to?

I also bought Clary Sage oil for my diffuser (said to help labor start don’t ask me how I’m jus as confused as you) and boy does it smell awful