Diet Coke and ttc

So I know it’s generally understood you should try and not over do it too much on caffeine when you’re ttc...I’ve been trying to cut back on coffee but now that it’s summer I’ve gotten in the habit of drinking Diet Coke (which I know diet is not the greatest for other reasons besides caffeine). It used to be one every now and then, now it’s more like one a day.

Anyone have any thoughts or talked to any professionals about this? Could one a day affect fertility?