My cheapies were 10 ul too, (which is more sensitive than 25 ul) and 1 day before af due I was getting mega faint lines on those. I did a digi in the morning (along with a trillion other tests ) and it was
i think you are defo pregnant. even if its a faint line theres usually a reason for it being there. even the £1 tests work, i hope u are, best of luck! Lynxy x