Are you saying that more starches=more fertility?
I would lean toward more starches=more calories=possible higher fertility. Honestly I don't think its something you'd have to worry about if you're getting plenty to eat. I think, depending on your workout schedule, you could skip the starches as long as you have enough fat-but now your talking all those micro-nutrients/macro-nutrients and I've never gotten into balancing out exactly what I eat.
Also, I'd watch out that you aren't looking for an out (ie I want to get pregnant so I should have a heaping pile of mashed taters). I say that 'cause I've done that and now I'm back to not fitting in my jeans and having to clean out the cupboards of crud that has sneaked in. *sigh*