L.S.
Before spending money on fertility monitors, I would highly recommend reading Taking Charge of Your Fertility, by Toni Weschler. I was amazed at how much I learned about myself by reading the book (things they SHOULD have taught you in Jr High Health class) and have recommended it to numerous friends who have been similarly amazed. It teaches you to do fertility charting and learn about your cycle. It is a heck of a lot cheaper than a fertility monitor and more informative! I got pregnant during my 1st month of charting using the book (as did several friends!)