I just know that the ferning is the fertile stage. When the ferns are at their bigest and clearest, this usually means That you are at your Most fertile day. HTH, Good luck
I just had a look at my chart for when I got a BFP with Gabby. I had partial ferning several days after O... it was a pretty crappy chart tho (in hindsight). I think I'd given up on charting properly by then, LOL.
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