Kidney stent at 31 weeks

At my 28 week appointment, my OBGYN saw that there was a lot of blood in my urinalysis and asked if I was having any other issues in that department. I told her about the flank pain I'd been having and she sent me to my urologist. My urologist ordered a renal ultrasound, which did not show any kidney stones (which I have a long history of) but did show that the left ureter appeared to have a kink in it. She prescribed Tylenol 3 and we waited a week to see if the situation improved. My pain continued to get worse, so she decided that it was best to put me under general anesthesia and do a ureteroscopy. When I woke up, she had placed a stent from my left kidney to my bladder so if could properly drain.