pregnancy test help needed please

AF is now 6days late took a test tonight a Tesco own brand and it said negative but when I too the strip out as you change it for second one is had one dark line and a faint line on the positive bit showed my husband and he said he could see it as well should I test in morning again or just take it as digital bit was wrong?? Should say past 4/5 days been feeling sick all day with spurs of dizziness help please