Vitex and progesterone

I was taking Vitex pills before I got pregnant for only about a month. My doctor prescribed progesterone because I have had 2 early miscarriages. I thought I would just stop taking Vitex then start the progesterone. Has anyone had similar experiences? I know if you stop taking Vitex suddenly it could cause a miscarriage but if I am taking the progesterone I was hoping it would be ok.