Suggest Treatment For Blood In Urine While On Medication For UTI

Hi,
I was suffering from a UTI - I was put on Amoxicilian for 7 days. I've completed my antibiotics, and now, a few days later - find that I am still peeing frequently and now I have traces of blood when I pee. I only see the traces when I wipe .... I have had multiple bladder infections over the past year - I've been on a series of antibiotics and nothing is helping. It's not painful when I pee, it doesn't hurt and I only get a slight ache on the left side of my back aright below my ribs. Should I go back to the doctors? Is this a kidney infection - should I go to the hospital instead before it gets worse?