What Do Rashes In The Groin Area Indicate?

I have been dating the same boy for over two months, and we have been each other’s only two sexual partners that whole time. The other day I started to breakout in an extremely painful rash on my genital area, it does not hurt to pee at all, and the pain is just a burning sensation. The whole area is very red and swollen. I went to a fast med place and the doctor thought it was genital herpes, and she ran a test for it. I’m freaking out and want to know my odds sooner, so what are the chances that’s I have genital herpes? My boyfriend is having absolutely no signs of symptoms of herpes, and never has. I am also anemic and have an extremely weak immune system.