Thanks for writing your query to us.
test detects the amount of HCG
in your urine only after it reaches a certain level. If the levels are too low than the test may come negative or may show a faint line.
First of all you need to know your menstrual cycle length.
If you have 28 days cycle, that means if you get your periods every 28th day than wait till you miss your period & than do a home pregnancy test.
Repeat your test after 2 days till that time your HCG levels would also increase if you are pregnant.
Wish u best luck.