i am assuming the pee on test theory will only prove if its real or not.. it will not confirm if its fake though. in other words if you pee on the stick and it comes out negative it doesn't necessarily mean its bunk, but if you pee and its positive then you are g2g.
i know a lot of chicks who have tested themselves and its come out negative, but they really were pregnant.. but if it shows you are pregnant than you are pregnant. hope this gibberish i wrote makes sense