Did i read the test wrong or is it aa BFP???

ok i have a 24 day cycle so i should start today (24th of oct.) well i took a hpt wal mart brand that has blue dye and i took one friday in the morning and i thought i saw a line in window one but i could only c it when it was up to the light, it looked like a white line kinda.. so i took one again sat which was yesterday morning and i didnt even have to put it up to the light and i saw the line this time and it was blue but at the bottom of it but this morning (sunday) i looked at it again and theres nothing there, so was it just cause its a cheap test? now today im feeling kinda dry down there so i dont know if thats a sign af is coming and underneath and on the sides of my stared hurting today so should i take another test like first response or do uy think af is gonna arrive?