Help please with advice about herbs to help conceive?

I read on a fertility website that chasterberry ( angus cactus, vitex ) and dong quai can help balance hormones and help to ist fertility and menstrual problems. these are both herbal tablets which you can get from health shops. I was just wondering if anyone else has had sucess falling pregnant with the help of herbal remedies. I have had tests done and everything seems ok and has been put down as unexplained fertility, i have been trying now for 4 years and am starting to think i will never become a mother, nearly all my friends have children and i feel abnormal. Can anyone give me some hope. thanks to anyone who answers.