I went to er, blood in urine, pain in the urethra, urgent need to void. Results ecoli in urine, symptoms gone in 6-8 hrs. Is this normal?

Not usual. You had a UTI if your culture grew out e.Coli and you had those symptoms. They usually do not go away without treatment, but it is not impossible. People have UTI and clear it on their own without antibiotics at times. It usually takes longer than 6-8 hours though.