Well, I hate to be the bearer of bad news diddy, but I used cvs opk tests before too in desperation because I was kinda broke and really needes to buy some... but after my experience, I will never use them again, cause seriously, I was getting two lines every single day almost the entire 2 ww... solid lines...and it gave me false hope that I would get my bfp because the same happened with the early-pregnancy-tests.com kind i had used.... only that time when I used the early-pregnancy-test.com opk's at 12 dpo, the two solid lines it gave me DID end up being my first bfp 3 yrs ago. So, naturally, I thought the same thing was happening when this happened to me using the CVS opk's, and believe me... I do not have PCOS, so I do not know why in the world the CVS tests were doing that. I read the reviews though, and they were not good! But I read the reviews AFTER I made the purchase.. stupid me! Anyways, perhaps you will not have the same experience and they will work out fine for you. I used them as the directions stated, and it was so frustrating what was happening. I could swear that even if I had a guy pee on them, they probably could have gotten two lines with no problem! I stopped using opk's all together and now rely only temps and my cycles set patterns, as well as cervix and checking cf. I usually get ov pain too... but I will tell you I used first response digi opk's because I thought they would be a guarantee of knowing the O without guess work and analyzing dye lines. I do think the first response were good, but when you know you usually ovulate on like cd 15 and beyond and have to keep testing from cd 5 to get the -NO answer each day was annoyi ng. .. but you have to settle with dealing with that b/c I guess it measures your levels from cd 5 to know the exact peak and the device remembers everything.. very inventive yeah?! I got my YES + on day 20 awhile back so I know it was accurate because temps also verified as well as ewcm and cervix position, etc.. o pains. Well anyway... good opk's are so expensive that I had to stop because of the financial constraints. I had a couple very random freak cycles of one being 37 and one being 40 days long omg... and in those cycles the first response would have been a waste of $30 or whatever because if you ovulate beyond cd 24 I think it doesn't even work for every woman!! How sad huh?