Saliva Microscope

Just prior to ovulation, estrogen levels increase dramatically resulting in biochemical changes in the composition of your saliva. This spike in estrogen - which indicates that your peak fertile time of the month is at hand - is easily detected when a saliva sample is viewed under a microscope. It creates a highly recognizable "fern-like" pattern which resembles frost on a windowpane.

There are several brands of saliva microscopes, each with their own features and advantages.
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