Has anyone ever heard of this? I was reading up on how to track OPKs (doing it for the first time this month, on cycle 3 of TTC) and came upon this:
*Salivary ferning kits allow you to test your saliva with a pocket-sized portable microscope. As your oestrogen levels rise, the salt content of your saliva increases. When the salt dries, it crystallises into a fern-like pattern.
In the two to three days leading up to ovulation, and for a couple of days afterwards, salivary ferning is visible so checking for this helps to identify your fertile window. When you are not in your fertile window, your saliva will dry in shapeless blobs .*
I've never heard of this before. Has anyone tried it? Sounds a bit mad.