Perhaps inflammation from the intestines is irritating the bladder and causing the blood in the urine?
Maybe your uterus has dropped some and is putting some mild pressure on the bladder?
"They" just don't seem to be all that concerned about blood in the urine any more once they've checked for any obvious abnormalities as long as we are asymptomatic.
Look up "hematuria" online.
My urine is always lemon yellow from the Imuran and/or Pentasa. I'm 70 and past menopause obviously yet occasionally I will get a day or even two or three w/pink or brown spotting for which we can find no cause.
A few weeks ago w/absolutely no symptoms whatsover I dumped enough blood in my urine that you couldn't see the bottom of the toilet so I went to ER. An ultrasound, CT scan and cystoscopy found absolutely no abnormalites in the bladder, kidneys, ureters or urethra. The first urine culture done in ER did show likely bacteria and budding yeast so I was scripted Keflex for 7 days and 1 day dose of Diflucan. My urine cleared up to a point. A urine culture done the day of the urologist's cystoscopy revealed some blood in the urine but no bacteria or yeast - so - no medication, no worry, live w/it.