just wanted to pop in and say that the pp is right about the opk maybe not being sensitive enough. for the first 6 months i was ttc, my opks got really dark when they were positive.. then suddenly during o time i would get opks that were really close to being positive but they weren't "technically" positive.. even though i knew they were. i was using the same brand as you also. I decided to switch to the high sensitivity strips (they have some wondfo opks that measure at 10miu) and now when my opk is positive, it's SUPER positive! You should try getting some 10miu ones too. Its even more fun to get an opk that is so positive that it sucks all the dye from the control line! Love it. Good luck hun!