Mama, 36 days late is quite significant na talaga, a faint line kahit gaano kaliit should be taken seriously, kaya I'd really suggest taking a blood test or going to your OB para ma-confirm, lalo na kung consistent ang faintness across multiple tests or may other symptoms ka na. A few of us din experienced faint lines na nabago depende sa timing ng test at hydration, pero after 36 days late, mas maigi na talaga yung medical confirmation para sure na kayo, either way, kailangan mo ng peace of mind, di ba?