I think i may be pregnant as my period is a week late ive had some very very faint positives but some negatives not all same brand. could i be?

Yes. If this is an: ...early pregnancy and your urine is dilute (i.e., contains a lot of water), a pregnancy test might miss a pregnancy. However, the hormone detected by home pregnancy tests, rises rapidly in the early weeks. If you have a healthy, normal pregnancy, the test will be obviously (+). Keep in mind that a pregnancy that isn't going well can give variable results. If you have ?'s, contact your GP.