Okay guys. Update!

So I went to then Dr yesterday for a pregnancy test and for the UTI. Turns out I'm not pregnant and I do have a bladder infection. That same day I started my birth control (the progesten shot) and I was given a perscription to cure the UTI, all is good! My period has yet to come on yet though and its been over a month since my last period (still worried). I don't know what it could be, any suggestions on what it could be ?