Hi I've been doing tests over last few days few positives and some negatives not sure if it's because of how sensitive some are did one with my fmu this morning and showed negative after getting a positive last night done another one and it's showing a vvvvvf line with the same test Asda cheapies .. what's everyone's experiences with fmu and did anyone's look darker as the day went on I'm worried about a chemical .. pics included the last one was is last nights changed the contrast a little and today's is vvvf can anyone else see anything so confused !! 