Hindi na po valid result yung pt test after 30 minutes. supposedly when pregnant po, it will take only 5 minutes for the second line to appear since pt test is a rapid test, if pregnant po it will eventually appear po even if it's a faint line due to the increased level of hCG sa blood. yung appearance of faint line after 30 minutes is normal but it doesn't indicate a positive test since it exceeded the time already. i hope it helps.
Marilou Kimayong Guazon