Confusion...

ok so my period is late by 5days but I also have a UTI so I wasnt to concerned. until I started have sore breast and not feeling well . I took a pregnancy test and it came out positive so i waited a day and took another that one was negative. I am very confused by this. not sure if im pregnant or not?

anyone been through this or have an opinion??

p.s. yes I am being treated with antibiotics for the UTI