BLADDER INFECTION, ACUTE, OR SERIOUS?

Several weeks ago,<-(key point), I had symptoms of a uti, plus a fever and intense flank pain. Since then, the intense flank pain and fever aren't present, but I went to ER to be sure last week, and was diagnosed with uti, and sent home with antibiotics(and yes I informed the dr of my previous symptoms). My question is, just because I don't have a fever or severe flank pain anymore, does that mean that my infection isn't considered septic, or serious enough to be hospitalized? I was told that an accompanying fever was a sign of the infection going septic. So I thought that meant in general, regardless of if I don't have a fever at the present moment?