26 weeks blood in urine

Alright so 2 weeks ago I noticed period like cramping that was constant and painful. Called my ob, went in they checked baby, my cervix and everything was fine. However I even gave them a sample with blood in my urine and they did nothing. I called the next day when nothing was changing but getting worse they basically ignored the blood in my urine again and said to just follow up that Friday at my appointment. Cramping continued through the week to the point I couldn’t get out of bed. Friday came at my appointment they did a urine culture said they would call if anything came up. They never called I tried calling they said a nurse would call back but never did. Since then cramping has come and gone, sometimes to the point of tears. Today it’s back to being all day and there’s a lot of blood in my urine. I don’t know what to do. I can’t get answers. Anyone experienced this?