The following is from:http://www.ovarian-cysts-pcos.com/vitex.html
How does Vitex Work?
One of the ways Vitex works to shift in the ratio of estrogen to progesterone, in favor of progesterone. Chaste tree berry works to raise progesterone levels in the body.
SO if you were to take both Vitex and progesterone - I think it would confuse your body to get this sudden surge of progesterone - the vitex would be redundant (progesterone is also listed under drug-interferactions of Vitex).
When using chaste tree berry, donít expect immediate results. It may not have much effect until it is taken for at least 3-6 months.
Itís not the same as taking progesterone. You donít give it, stop it, and then expect a withdrawal bleed a few days later as you would if you were taking progesterone or synthetic progestins. Drug Interactions
Interactions with hormone replacement therapy (potential/theoretical). Animal studies and human data have reported that chasteberry constituents have hormonal activity that may alter the effects of these medications and possibly the dose needed for treatment. conjugated estrogens, estradiol, estrone, esterified estrogens, estropipate, ethinyl estradiol, progesterone, medroxyprogesterone, hydroxyprogesterone, norethindrone.
Interactions with oral contraceptives (potential/theoretical). Animal studies and human data have reported that chasteberry constituents have hormonal activity that may alter the effects of these medications and possibly the dose needed for treatment: norethindrone, ethynodiol diacetate, norgestrel, norgestimate, ethinyl estradiol, drospirenone, desogestrel, levonorgestrel .
Interactions with dopamine agonists (potential/theoretical). An in-vitro study reported that chasteberry constituents had dopaminergic activity that may alter the effects of these medications and possibly the dose needed for treatment: selegeline, amantadine, carbidopa, levadopa, pramipexole, ropinirole, bromocriptine, pergolide. If you are taking any of these medication, it's a good idea to consult with your physician before taking vitex.
Hope this helps. Is there anyway you can seek out a certified Naturopath under your coverage? I only ask, because it seems (from your other posts) that your doctors are not very supportive of you ttc from a natural approach. Just a thought, my Naturopath is the best and she is a wealth of info. and support for me.