False Positive Tests & Kidneys

Hi all, not too sure where to put this but here it goes. My husband and I are ttc our rainbow baby following a miscarriage in June. Recently my doctor asked for test as there was protein and lucocytes in my urine. I am awaiting test results. Yesterday and today I got faint positive pregnancy tests and am worried it's a false positive because there was protein / white cells already present. has this ever happened to anyone ???