Ay, don't worry ka muna, this actually happens sa marami, especially kapag fresh ang pee mo the first time versus diluted na ang second test! A strong positive is still a positive, and faint lines usually mean you're definitely pregnant, hindi nag-eevaporate or anything scary like that kaya relax lang. Pero honestly, best to follow up with your OB na para sa blood test (quantitative hCG) to confirm everything is progressing well, na-assure ka talaga doon at makikita niya exactly kung saan ka na sa pregnancy. Congratulations sa baby, mama! Sobrang exciting pero go see your doctor ASAP para sa peace of mind mo.