well hun, i did 2 tests with my last pregnancy and they both said negative, coss the reading was not as accurate as it said on the box !!
it took ages for the test to show, i did 2 tests and put them in the bin next to the toilet, they read negative, 2 days late i was still feeling sick, so i did another test "positive" i remembered the other 2 tests were still in the bin, i looked at them and they then said positive! they just did not change like they said on the packet!!
make sure u leave long enough for the test to change
Good luck hun !!
xx