Getting tested at doctors

Usually my mom comes with me to my doctors appointments (i go to a pediatrician and i'm 18) and i have a physical/birth control checkup in august because I will be leaving for college in september. i had unprotected sex about 3 weeks ago and i know he's been with other people but swears that he's clean (we all know people lie about these things). i want to get tested for stds during this visit so that I don't have to make a separate trip but how can I go about it when my mom is there? i also do not want my parents finding out at all and am nervous about the doctor calling or mailing results to my house. has any ever gone through this? please provide any info you have!! thank you :)