Hello Thank you for your query. Haematuria during pregnancy could indicate a urinary tract infection , not necessarily detected by examination. Also, it could be due to reasons like renal stones, compression by the pregnant uterus, or infection of the upper urinary tract. You need to have a complete urine examination, including urine routine and microscopic analysis and a urine culture. I think you should definitely call your doctor about it, as you are already having a high risk pregnancy , also undetected and untreated urinary infection would cause preterm labour. Take care.