Severe UTI in second trimester?

I'm curious if this is common during pregnancy? I just had my first baby 13 months ago and never had a UTI with her. What freaks me out the most is how sudden it came upon me. There were no warning signs at all. One part of the day I was fine and then suddenly I'm peeing every minute and it feels like I'm peeing glass. Very painful. I started bleeding and that freaked me out so I went in to see the dr and she wasn't available so I had to see the nurse practitioner. I had level 3 blood in my urine. She listened to the baby's heartbeat and checked me vaginally. Everything seemed fine. She told me to take AZO. Are you kidding me?!? I was in so much pain and so uncomfortable and she isn't going to prescribe me an antibiotic to clear this up????? So now I'm worried because I feel like she didn't examine me well enough since she obviously didn't have a brain. Its been 4 days now and I'm still feeling funky. Not sure what to do. I've taken the AZO, cranberry juice and plenty of water. I've also been taking an antibiotic they gave me for a bladder infection during my first trimester that I never took. Called the nurse and she said it was ok to take it. Is this common or should I try to speak to my doctor about this?