I am new at the OPK think, so I'm not quite sure how it usually works. I have doing OPKs since Day 10, one that day, one the next and yesterday I used one. Each time it was fairly light. It was there, but very obviously negative. Last nights was just an eensy bit darker than the other two had been and when I tested this morning it was a lot darker, but still not positive. I wish I could take a clear picture, but I'm having a heck of a time. I was planning on testing tonight anyway, but I was just wondering if I should look forward to a positive tonight or if I'm going to have to ask DH to come home for lunch tomorrow.