Confused

Yesterday and day before got faint positives on a clear blue test and a £1 pink dye test. Took another test tonight on a cheap strip test and can barley see a line, if anything. Could both the other tests been false? Or could my urine be super diluted as it is night time? Or what? I usually have trouble with the strip tests because of line eyes and such. Any help and advice would be greatly appreciated. Thanks ladies