I have been with my boyfriend for over 3 months. The other day after a shower, I noticed my labia majora was a bit rough (I had shaved with no shaving cream. I had sex pretty soon after and had sex the next day. There was some friction during sex and I was sore immediately after. I noticed I have one some ulcer like item on my inner vagina one and one larger clear like ulcer outside on labia majora.  Can herpes ulcers happen instantly or do you notice them prior?
Lesions of Herpes appears from8 10 15 days after incubation. The best way to know is to do a Track Test. In order to know if it is herpes or not. You should visit an specialist.