Treating Short Luteal Phase

by Melissa
(Australia)

I have a luteal phase of 10 days, which I know is on the shorter side of normal. I have just started taking 25mg B6, 1000mg Evening Primrose oil and 500mg Vitamin C. Do you know if this is a safe combination? I have also read that Vitex may help a short LP, and I've taken this previously with no side affects. Would it be safe or wise to take all four of these vitamins/herbs together?
Thank you!