Wow, who would've known. Thank you so much for telling me this. I was stressing out that I didn't ovulate this month. So, I think I will try Clear Blue Easy or Answer 20pk of strips.....Did you try the Clear Blue Easy too?
I wish I could find the link for you to show the amazing difference from brand to brand. It was an independent test on hpts and opks that the CBS Morning Show did some time back. Their findings corresponded with Consumer Reports. Every brand is senstive to a different amt. Some will never work on some women and some will show pos repeately for some women because they are too sensitive. It sounds like you probably need one that is more sensitive than not. Clear Blue Easy (regular not digi) is rated the highest in sensitivity. I have found the Answer 20 pk of strips to work well, too.
If its only been 8days, hold in there. They should start to work. From my lmp to my 1st + it was over 2weeks..