I was confused about the ferning also.
I just bought the saliva scope (Ovulite) yesterday so this morning was the first time I have used. It looked like the positive ferning it showed in the insert though. I had my Dh test his spit just to make sure it was working and sure enough, his was negative.
I'm hoping I don't have some sort of hormone imbalance...
We did go ahead and BD this morning just in case the dip today was me Oing.