HELP ASAP POSSIBLE HERPES SORE pics included

i am really freaking out i wiping myself before bed and felt this sore like thing right between my anus and vaginal opening
i am quite chubby and sometimes wear tight underwear so i dont know if its a sore from that is coming from that
i had unprotected sex 3 days ago and i am scared out my mind
please help
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I don’t see any pics

its not letting me upload