Okay I'm totally confused and I can't find any answers on the Internet. I've been taking the regular clear blue digital opks for the last few months (and charted) and always ovulate on day 13. Well this cycle here I am at CD 14 and no surge. No ovulation. I'm stumped, so I stopped at Walgreens and picked up one of the advanced tests hoping I would get some more information from that. I thought surely I have to be in at least peak fertility, because how could I be more than four days away from ovulating when I normally would have ovulated yesterday. But no it was negative. Not even a flashing :-). I thought maybe my urine was too diluted so I waited and tested again later, and that time there was a flashing :-). But then I read that you have to use first morning urine.
So I guess my question is:
1. Does the test have a memory that compares tests? Or is it just testing the levels of hormones in your urine?
2. Did I screw up by taking two in one day? Have you ever done that with this test?

Thanks in advance! I'm getting sooooo frustrated with this cycle!!