Hi all

I have the Fertility Naturopath OPKs. Tonight, for the first time I got a really faint line under the control line (and I mean really faint, hate to have it 10cm from my eyes to see it, but it was there!).

Are OPK lines the same as HPT lines - ie they get darker as you get closer to Oing? Or, they could stay faint and still remain a -ve?