Taking Charge of Your Fertility Software has not been cleared for use in the United States as a method of birth control. It is intended to be used for pregnancy achievement purposes only. While this discussion mentions FAM as a method of birth control, it is intended only as background information on the method itself, it does not describe features of the software.
In Short: The fertility awareness method is a natural method of pregnancy achievement that requires no drugs or hormones. It relies on various body signs to identify a woman's fertile period and to estimate her day of ovulation. Because of its ability to accurately identify days of high fertility, it is also effective in helping couples achieve pregnancy.
The fertility awareness method (FAM) was originally established as a scientific and medically based method of natural birth control that relied on signs from a woman's body to indicate when she was fertile. It is not, and never has been, the "rhythm" or "calendar rhythm" method.
All birth control methods are evaluated based upon their use- and method-effectiveness. Method-effectiveness assumes "perfect use" and isn't quoted here because it only serves to confuse. For comparison's sake, the birth control pill has a use effectiveness of 97%. FAM, on the other hand, has a use-effectiveness of up to 90%, which is about the same as that of the male condom. What this 90% use-effectiveness figure means is that 1 out of 10 women who use this as their only method of birth control will experience an unintended pregnancy during the course of a year. If you were to use it as your only form of birth control for 10 years, you could expect one unintended pregnancy.
Because FAM can accurately identify days of highest fertility, increasing numbers of couples seeking pregnancy have also used it.