I just wanted to post this as a guide for anyone using digital OPKs. This is probably why they say not to go by the lines on the stick but to go by the reading itself... this is my POSITIVE opk from this afternoon. Barely a second line even there but definitely a smiley face. This is the Clearblue Digital brand. I have been using them for 3 cycles and the last 2 cycles they have been accurate and I like that I dont have to be wondering whether the lines match!
I hope this can be help to someone out there! I know I googled it when I first started with the tests
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