I just finished the book, "making babies, a proven 3-month program to maximum fertility" by Sami S. David and Jill Blakeway. You can find it on Amazon.com here: http://www.amazon.com/Making-Babies-3-Month-Program-Fertility/dp/0316024503.
I am not pregnant yet; however, this program is exactly what I have been looking for - something to help me best determine if I have done everything I can NATURALLY before I jump head first into infertility treatments. I was shocked to find out how small things like the lubricant you use might keep you from getting pregnant. Missionary position is the best for getting pregnant. Don't move around for 10 - 20 minutes (but you don't need to stand on your head), etc., etc. I'm hopeful it is one of these little things that does the trick!