Do I have herpes?

Hello, I’m nervous that I May have herpes. I had unprotected sex with someone about 2 months ago one time. About five days ago, I noticed pimples around my anus. They do not hurt and have not increased in size or broke open. Since then, I have not had much itching in my genital area, but a strange pressure like feeling. I am extremely anxious over this situation every day, I am wondering if my mind can be creating symptoms. I also developed lower back pain yesterday, but I do have scoliosis and get back pain here and there. (Haven’t had back pain in a few months)