vitex chasteberry tea?

Hi all! Has anyone taken these? I am on month 2. I have a 27/28 day cycle and wasn't getting my LH surge until day 14 (meaning I ovulate on of around day 16), so I was worried I may have a short luteal phase and that vitex can help. Now after taking the vitex, my surge was on day 12. Wondering if anyone has tried vitex and that's what's possibly making me ovulate earlier?