How long can trichomoniasis go undetected in a woman? - trichomoniasis how long does it last I am 16 weeks prega at 8 weeks of pregnancy I had all my blood tests and Pap smears Docter asked to test me for everything, including HIV, as 8 valves as blood and made my Pap test results everything is back to normal, but he had a kidney infection, so I took the Tablets for ten days for this.