Below are some good starting points for natural family planning:
1. Taking Charge of Your Fertility by Toni Weschler
3. La Leche League International website (llli.org)
4. Institute for Reproductive Health website (irh.org)
5. Couple to Couple League website (ccli.org) offers local or online classses
6. Cycle Beads (search online, can make own or purchase)
7. Fertility, Cycles and Nutrition by Marilyn Shannon
8. Smart Phone Applications (can help you chart, but a book is still a good idea because the app probably will not explain everything, and a class is even better)
This method takes a little extra effort to learn, but if practiced correctly is just as effective as methods such as the pill or IUD without the side effects. Ultimately, it costs less money and is better for the environment. More is known now about the fertility cycle than ever before and long gone are the days of the old ineffective rhythm method. Modern natural family planning is much different, and involves using several methods such as recording a waking temperature every day and a mucus sign and checking the cervix.
Also, it is probably good for a responsible teenager to study this as it can help her avoid a painful period and be prepared with menstrual pads when her period happens. Toni Weschler has a book aimed at ages fourteen and up called Cycle Savvy. There are actually cloth menstrual pads for anyone who did not know that. The Couple to Couple League is diverse and open to all groups of people and you do not have to be married to take the class. You could be single or taking the class as a couple before marriage or any other situation. Charting your cycle helps you become more health conscious and could alert you to health issues before they become more severe.