Dear Customer (name blocked for privacy):
White blood cells in the urine is not an indication of pregnancy. However these tests are sensitive two weeks following pregnancy. If you feel that at the time you had the urine test you were less than 2 weeks pregnant, then the test can be negative and you need to be tested again.
I hope this helps answer your question adequately. Please press ACCEPT for me to receive credit for my work. Feedback and Bonus are always appreciated. If you need further clarification, please do not hesitate to ask.
Dr. Ketch