"Phytoestrogens
Phytoestrogens work by weakly binding with estrogen receptors, giving in some cases very mild feminizing effects. However, the doses required to achieve any effects at all are prohibitively large and toxic. (FAQ: Hormone Therapy for M2F Transsexuals) Most sources do not recommend that trans women use black cohosh, dong quai, milk thistle, or any other phytoestrogenic herb as a replacement for hormone therapy, even as a low-dose measure, because of their inefficacy. Because of the way that phytoestrogens compete with estrogen for receptors, using them in addition to hormone therapy may also be counterproductive."
I highly encourage you to do research before self-medicating, it can be very dangerous.