This is the first month using these opk's. I used to use the CB digitals smileys, but they're getting way too expensive. Anyway, I've been testing three days now, and I'm so confused..... in the morning the test looks almost positive. It was so dark this morning I thought for sure it would be positive tonight.... NOPE.... the line is lighter tonight than it was last night. I'm getting dark lines in the morning and light lines at night. My surge is short, but not this short! Any thoughts ladies?