Hi ngala,

I have heard possible soy protein can affect fertility but this is inconclusive. I do not think it would affect TTC really.
I have read some other stuff that suggests it is actually good for fertility.

How Protein Increases Female Fertility

“The recommended protein consumption for nonpregnant women is at least 45 to 50 grams per day,” writes Dr Williams. “Once pregnant, a woman needs to increase her protein intake to at least 60 to 65 grams per day.”

He also says that women who exercise more need to increase their protein intake – and also take more vitamins and minerals via a supplement. And, don’t forget the folic acid…take it before you start trying to conceive a baby!
So it sounds like as with a lot of things TTC there is a lot of mixed information out there. I don't know if I have actually been any help, but it sounds to me like your leading a very healthy lifestyle and protein is essential for training, so I wouldn't cut it back to dramatically but maybe cut back a little and see.