Good for you and Dearest. The use of NFP to avoid pregnancy can be a struggle, but compared to the alternatives ... egad! Besides, starting a family at your stage of life, I'd think "avoidance" is the last thing on your mind :-). There is nothing more enjoyable than a Personal Relationship during your ovulation. The Urge to Merge is an unfailing indicator of fertility, at least in my experience - I even note it on my NFP charts, when I'm bothering to chart! Gosh, what was God thinking?
http://www.cyclebeads.com/
Getting one of these so I can get used to it. I find that I'm getting more in tune with my body. I also know that eating no meat shortens my *moon time*. If the urge to merge indicates fertility then I'm very fertile :O)