Given all the information, including your negative PCR at 13 days, the chance you caught HIV is no higher than 1 in a million, but you need an antibody test to nail it down for sure. <a href="http://www.medhelp.org/posts/HIV---Prevention/HIV-PCR-Test-13-Days-Post-exposure/show/1827725">http://www.medhelp.org/posts/HIV---Prevention/HIV-PCR-Test-13-Days-Post-exposure/show/1827725</a> Edward W Hook, MD Nov 19, 2012 You are splitting hairs and asking for data that do not exist.