Aih sayang, kalau line samar macam tu memang sulit nak determine sendiri, better you go see your doctor or do a blood test (HCG) to be sure, sebab hormonal contraception memang boleh affect timing. A few of us tried different tests and timing, tapi the only way to be 100% sure is bloodwork especially bila you're on the pill. Don't stress lah, doctor can advise you properly on this. Wishing you clarity soon!