Melissa_M - I wrote about vitex a page or 2 ago if you want to check it out - I also mentioned the brand and dose.
This month after taking the vitex my OV was 2 days earlier, making my LP 9 or 10 days. The FS said that it was basically impossible to get PG with my cycles the way they were (6-8 day LP, 23 day cycle) but on the vitex I got almost 10 days and my hormones were way more level. .......And I got a faint BFP yesterday!! I am classed as a threatened miscarriage though, as have been spotting/bleeding (I thought it was AF). They are checking my HCG levels though to be sure. I'm just hoping my low progesterone is causing the spotting, but things aren't looking very good. If you want the whole story you can read my journal - I won't go into all the details here.
Regardless though, the vitex worked well enough to get regulate my cycles and get a 9-10 day LP which was enough to catch the egg! So I will definitely be staying on it.
xx