There are lots which can help but perhaps the two most useful are False Unicorn Root and Vitex Agnus Castus. Both of these herbs are excellent promoters of fertility and have been used for hundreds of years to aid conception.
False Unicorn Root is an excellent all-round aid for the female reproductive system and normalises the menstrual cycle, whilst promoting regular and frequent ovulation and improving the condition of the womb - thus aiding conception. It also helps to maintain healthy ovaries and balance hormones.
Vitex Agnus Castus (also called agnus castus, vitex or chasteberry) helps to strengthen the all the female reproductive organs whilst also balancing and maintaining correct hormone levels throughout the whole body. It also helps with ovulation and in general helps promote ideal conditons for conception within the body.
You can choose to take either both of these herbs at the same time or just try one. They are available in capsule or tincture form from you local health food store. All instructions for dosage will be clearly marked on the bottle.
I can also reccommend you drink either nettle or raspberry leaf tea on a daily basis.
Once you become pregnant, it is best that you stop taking these supplements. If you wish to continue herbal medicine during pregnancy it is reccommended that you visit a professional herbalist as he will be able to assess which herbs will suit you specifically.
However there are some herbs which are perfectly suitable for anyone to take during pregnancy, details of which can be found at:
http://www.anniesremedy.com/remedy_use60...
Good luck and I hope this has been of some help x