I would like to know if this is the case? I have always used the ones with pink lines. WHen I POAS with my last baby, it was the day of my missed period and the dollar store pink test was so faint i wasnt sure. I bought a FRER and it was a bit darker, but nowhere near as dark as the test line. This time, i felt implantation and tested 3 days later....it wasnt even FMU and it was totally clear with no color...so i was shocked that there was immediately a second DARK blue line, almost as dark as the control. This was 8 dpo. I havent taken any more tests....but i have conceived twins before and i am wondering if the immediate dark line might be signifying twins or if maybe the tests with blue lines just come up darker? Has your experience been that blue tests show darker? or not?