I have practiced the sympto-thermal method of natural family planning/fertility awareness for two years now and it is incredibly accurate. I use it to prevent pregnancy, but it's also used to plan pregnancy. Basically you buy a basal body thermometer and chart your temp at the same time every day, check your mucus several times a day, and check your cervix- chart everything. We took a class, but you can self-teach, especially using the "Taking Control of Your Fertility" book. We took a several month class that we found through our Catholic Diocese, but the book I mention is non-religious and will in no way push a religious based view.
One of the most simple signs of fertility for any woman is her mucus- any indicates the possibility of becomming pregnant, but runny, eggwhite mucus indicates ovulation.
The nice thing about fertility awareness is that it's super cheap and extremely accurate and it does not matter if you have "normal" cycles, of if like me, you have endometriosis.
I use this software, but you can order charts as well (for like $1.50):http://www.ovusoft.com/