Soy Isoflavones?

Has anyone taken soy isoflavones and had success in conceiving? Multiples maybe? How/when should I take them and how long for if I was to try this method of ttc? I hear it is like clomid and since drs won't help me I want to try it but don't know how to go about it. I wouldn't mind having multiples especially since my family history shows a hard time TTC and ending in a hysterectomy around our 30's-40's