I had been experiencing fertility issues/hormonal imbalances for a while, and had been trying to conceive for nearly 2 years. This past January, I started drinking about a half quart per day of an infusion of red clover leaves and red raspberry leaf, and conceived in my next cycle! A midwife friend of mine had strongly recommended these herbs, as she has seen huge success in clients trying to conceive. (She also gave me Susun's book, The Childbearing Year, which is quite helpful - a must-read!) I'm still quite early-on - only about 6 weeks - but am absolutely thrilled, and plan on continuing with the herbal infusions (adding nettle and oat straw).
I had actually bought a pound of Vitex berries when I started trying to conceive (along with the rrl and alfalfa), but only infused them once or twice a year or so ago, and for whatever reason did not choose to use them in my more recent (and more regular) infusions. Just thought I'd share my 2 cents - and success! - in regards to the other 2 herbs.
I do have a question myself, for anyone who is more knowledgable about herbs - is there a major difference between whole red clover blossoms and just the leaves? The blossoms are delicious in an infusion, but are much more expensive.
All the best of luck to you!