i looked into this and realised that although u critisize my response i am half right, if she is on hcg or has any health problems which is possible, the only way she could of had a false posotive is if the test was defective OR if she read the test after the 10 minute window home pregnancy tests come with. read the label.
false positives VERY RARELY occur and lies either on medication or the test itself.
u want a proper result get these AimStrip pregnancy test strips have a very good reputation of NOT leaving evaporation lines and are much less expensive than brands you can buy in your local supermarket or drug store.