Mouth sore after oral sex

Hello,

I have something sensitive I would like to ask about. I had oral sex with my new boyfriend for the first time 6 or 7 hours ago. I was feeling fine until I woke up and noticed I have a painful red sore in my mouth kind of above where my right tonsil is. Feels like either an open sore or a tear when I touch it with my tongue. I’ve never had this issue giving oral sex before, only broken blood vessels usually, but it was rougher than what I’m use to…I’m assuming it is just an injury that took a few hours to show up or feel…but I was wondering if a STI/STD would show up in a matter of hours of exposure? I was reading syphilis usually takes weeks to show up and just as long to heal so I’m guessing no on that, but couldn’t find much info on time frame for the other types of STI/STDs. I’m not going to be able to see a doctor for about a week since I am on vacation. Any information would be helpful and appreciated. Time frames, things to look for, whatever you think may help me.