Congrats sa pregnancy mo! Honestly, after a week the line ay dapat mas malinaw na talaga, medyo faint pa lang usually sa first week, pero by week 2 onwards nakikita mo na agad. Pero every pregnancy is different kaya hindi rin ako makapag-guarantee; I had one na super malinaw agad, tapos may kaibigan ko na kahit weeks na siya before the line became super obvious. Best talaga to confirm with your OB para sure at makita nila through ultrasound kung lahat okay, lalo na since 6 weeks ka na, excited na moment na yan!