I have been testing using my OPK and still have not had a solid positive. I test twice daily, once when I first wake up and second 12 hrs later. Like clock work!!!! I have seen many reviews with the kit I have that others have had the same experience. I average a 40day cycle and am coming up on day 40. Sadly I think this poor quality kit has made me miss my ov day. Totally my fault for not looking at reviews, I was just so excited to start tracking I grabbed the first one I seen. However, now I ask, which OPK do you ladies recommend? Baby dust to everyone TTC!!