NFP methods do require regular, consistent effort to determine when a couple's chance of fertility is low. For many women, the times of high fertility coincide with the time of highest libido.
For most women, their menstrual cycle is different in length each month, so NFP may not work well. The following may naturally cause your cycles to change month by month: changes in exercise habits... More ...
While it is also 95% effective at preventing pregnancy using Natural Family Planning (NFP), many women also use these beads to aid them in conceiving by helping them pinpoint ovulation.
 See also: Family planning, Ovulation, Multip, Fertility, Pregnancy
  
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