Hematuria means that blood has found its way into your urinary tract. There are many things that can cause blood to appear in your urine. For women, this could simply be residual menstrual blood. It could also signal conditions such as bladder and urinary tract infections or more serious issues like tumors in the bladder or kidneys.
Most causes are not critical, but since there are a few dangerous conditions that could be causing the bloody urine, you should consult your doctor if it continues. Your doctor will certainly run a urine test, but you may also be asked to get a CT Scan, which will look for abnormalities in the bladder and kidneys. As a symptom of thrombocytopenia it is evidence that your body isn’t clotting blood properly.