From every source I've read that didn't look sketchy, yes parts of the soy protein do get converted to strogen but you get healthy benefits concerning cholesterol and such but none of the negative parts of it. It has something to do with how it reacts to certain tissues. So, unless you're allergic to it, it probably won't hurt you.
Whey protein is protein it's purest form.. have you considered whey instead?
Is it okay for me to drink soy protein once or twice a month? Sometimes when I want to go to the gym with my friends after work i forget to take my whey protein powder so I can mix it at work and i have to go to my local food store and pick up a shake that is made from soy protein.