hi yes you can get a false negative and a false positive so just go get retested at a std/gum clinic the staff thee are very good at there job and there you can ask all the questions you want and they don't discriminate good luck
all my test were negative. i just wanted to know if they are acurate after 13 days. especially for hiv. . has sex with another male and used condoms. none broke. unprotected oral sex tho. i got my hiv and other std screens and everythig was negative. i just wanted to know how effective these were after 13 days