The Institute for Reproductive Health at Georgetown University has developed a new method of NFP called the "Two Day Method".
The idea behind it is simple: if you observe ANY cervical mucus today or yesterday, consider yourself fertile.
Otherwise you're not fertile.
That's it in a nutshell. (But don't try it until you actually learn it-- that's a summary, not a lesson!)
It's been shown to be 96% effective with "perfect use" and 86% effective with "typical use".
With perfect use, you have a 1 in 25 chance of getting pregnant. With typical use it's 1 in 7.
Depending on whose numbers you use, it approximates the failure rates of condoms, which fail 2%-15% of the time.
And oh yeah: post-partum women should wait 3 menstrual cycles before using it.
Here's a summary of a study done in Rwanda
Here's the actual paper
The beauty of this method: it's so simple. You don't even have to judge the "type" of secretions, like you would with the Sympto-Thermal method.
For some women, it could mean more fertile days. For others, it could mean fewer. It depends on your personal patterns. I suspect you could be thrown off if you eat certain foods that produce secretions, such as popcorn or carrots.
The thing that reassures me about the Sympto-thermal method is that you KNOW when you ovulate. If you've ovulated and several days have passed, you can't get pregnant. It's simple.
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