Blood In Urine

I think I may have had a bladder infection this week. I have had nausea for 6 days and I had painful urination and passed blood and tiny blood clots in my urine. I drank cranberry juice and the blood was no longer visible and the pain subsided. I went the the doctor who asked if it was a possibility that i may be pregnant and I said no because I am on NuvaRing, but I still don't think any of this could be related to pregnancy. I'm more worried this may have to do with my kidneys. They tested my urine for the bladder infection and she said that is was 95% gone, but wanted me back immediately if there was ever blood in my urine again. I feel sick almost everytime that I eat. I can count on feeling sick to my stomach at some point in the day. Any idea what this may be? The infection has cleared up but I am sick to my stomach and I have a head ache and sometimes my back hurts...kidney stones? still getting over the bladder infection? something serious? Anyone know?