Could my doctor be wrong?

Last year I had a erpes scare. I had a sore between my vagina and anus and had it swobbed by my obgyn and was told that it was a rash. Earlier this week it happened again. Not in the same exact place. I’m treating it like I was told to the first time but I’m scared that it’s been herpes the whole time. Going to the doctor tomorrow but I’m scared it’s serious.