After having sex with someone how long after can you get tested for herpes ?

2 weeks: Your chances of catching Herpes from your partner will depend upon the Herpes status of the partner, i.e acute infection, usually asymptomatic but contagious, with active sores or old inactive stage. Culture or PCR from the lesion or sore in genital area is better than blood test for antibodies that develop in a few weeks and only indicate old infection.