We used First Response because we wanted to know if we were pregnant right away. I had my doubts about it's effectiveness, but I figured we'd give it a shot. We weren't dissappointed! My menstration was only four days late when I took this test. The line showed up pink as soon as I used it! I was shocked at it's effectiveness! It worked so fast that I actually called the doctor and requested some blood work to confirm what the pregnancy test was saying. The blood test came back possitive as well and the doctor told me that modern day pregnancy tests are just as acurrate as the blood tests. This...