One good thing about pills is that you can break them down by ingredients. Looking at the website, the only thing that you wouldn't get from your diet naturally or a regular multivitamin is chasteberry(vitex). The website even basically says chasteberry is the ingredient that they are relying on to make you more fertile.
My recommendation would be to look up the individual ingredients. I looked up chasteberry and found one page that says chasteberry does have some potential for relieving PMS symptoms but no real proof on increasing fertility.
http://www.aafp.org/afp/20050901/821.html
Of course it may be something you want to pursue which is fine. I looked at the fertility blend website and a 1 month supply, 90 capsule bottle costs 29.99. Looking at drugstore.com, there are various pills with vitex (search for vitex if you look online or at a drugstore near you).
100, 400mg capsules of vitex from Nature's way costs $6.19
100, 500mg capsules of vitex from GNC Nature's Fingerprint costs $8.99
And most expensive is something called Femaprin from Nature's way with 60 capsules, (2 month supply) at $11.89.
The reviews are pretty positive on drugstore.com for vitex and it might be something you want to read.
http://www.drugstore.com/search/sear...&Go.x=0&Go.y=0
One thing I forgot to add is drugs are drugs, whether they are natural or man made. If you do decide to take this pill or others, inform your doctor as there may be interactions.