I spotted during the whole week before my period, now it hasn't come. it's been 5 weeks since the last day of my period. could i be pregnant?

Maybe: Pregnancy is the most common cause of a missed period. If not pregnant, other causes of a late or missed period include: excessive weight loss or weight gain, increased exercising, emotional stress, having an illness, traveling, medicines (especially birth control pills), hormonal disorders, etc… A home urine pregnancy test gives a reliable result 3 weeks after sex or 1 wk after missing a period.