Superdrug early tests are very sensitive, they measure at 10mlu, they're very popular amongst ttcers at the moment as they are showing bfps way before the new frers which are having problems with showing very late and faint bfps, they are also more sensitive than clearblues. Also, false positives are rare, false negatives common, and evaps do not have colour, the colour is only produced by the strip reacting with hcg, an evap is grey or colourless, and coloured lines can show up hours after doing the test, this is because it takes hours, sometimes days, for the test strip to dry out, and meanwhile the urine continues to travel along the strip reacting with the result line. There is a very thorough, if also slightly long, explanation of this on another forum by a clinician, I will try to find the link. Unfortunately a by-product of very sensitive tests being widely available is that they can pick up pregnancies so early before they've even had a chance to get going, and chemical pregnancies and early spontaneous abortions are extremely common, approx a quarter of all pregnancies end very early on, causing confusion as ladies get a very early bfp or even several bfps, and then get what they assume is their period. In the past tests were much less sensitive so ladies would have miscarriages thinking they were just their periods, so even though we think it's good to find out as early as possible, and in some ways it is, it's also causing a lot of unnecessary heartache. However, having a chemical pregnancy or an early miscarriage doesn't mean there's anything wrong with us, they're very very common and the vast majority of women go on to have normal pregnancies. If you get an early bfp on a sensitive test, maybe just wait another week to do a clearblue or frer, or just wait until you're overdue for your period x