Soy is considered by some to a natural Clomid and most people take double the amount of soy that they would Clomid (e.g. 100 mg soy equals 50 mg Clomid). Having never taken Clomid, I just started out with the lowest soy dose I'd read about, which was 80 mg. Soy works by tricking your body into producing additional estrogen, which kick starts the LH surge and ovulation.
People take soy on the same days they would take Clomid, either CD 1-5, 2-6, 3-7, 5-9. The girls on the thread I followed increased their doses over that span, as did I - I took soy CD 2-6, 80/80/80/120/120. From what I read, it's important to be careful not to take too much initially, as it can delay ovulation. As for which days to take it, the thought is that an earlier pattern produces more eggs, while later (5-9) would produce a higher quality, mature egg.
Who knows if it was soy that helped me or just chance, but I think it can be worth trying. Please definitely read more on it before starting, though - I'm certainly not an expert! And actually, maybe BabyBump can weigh in as she's a doctor and I'm sure has a much better scientific understanding
P.S. I think most places stock soy near the menopause supplements rather than in with the vitamins in case you don't spot it right away.
You hit it pretty spot on as far as how it's supposed to work, though. I researched it before using it to understand the mechanism of action and it seems to be similar to Clomid, but not identical. It's a phytoestrogen and theory says it should stimulate the body to increase Estrogen production by occupying the estrogen receptors. However, there is some debate as to if your body actually absorbs and recognizes it the same way and, as of now, there isn't any scientific evidence that backs up the claim that it actually helps you ovulate. The theory stands, though and had enough weight to it that I was willing to give it a go. I was pretty underwhelmed by it...considering I didn't even ovulate that cycle...but lots of a ladies swear it helped them get preggers.
Who knows? I'd be wary of adding it to a prescribed regimen, though.
Still a faint line, but it's getting a little bit more visible 
And now.. I'm away until around Friday night as we're moving today! 26 hour drive with all that stuff 
Have fun ladies 
At least we are all here onto a new cycle!! 
until you do 
