Pregnancy test

So i have a bit of a question!!! I took two pregnancy test two different days and they both came out positive but very faint lines!!! I went to my doctors appointment today and took one there n it was negative!!! On the way home i went and bought a ept test n it came out negative to!!! Doesn’t make sense to me n my sister told me the off brand tests are usually better n those are the ones that came out positive!!! I have seven days left til my expected period!! My breasts have been sore, ive been extremely tired and I haven’t been feeling well so thats my only reasons for even taking the tests!! Id like your opinions on what this means ill attach a pic of tge tests as well!! Thanks