Yes, wrong forum as you recognize below. But the response would have been just as brief had you asked on the HIV forum. Almost every time someone says they found similar questions but thought theirs was sufficiently different to ask it again, they are wrong: the differences are sufficiently minor that they make no difference. Same here.
It is the rare 18 year old who has HIV in the US and other industrialized countries -- and it does make a difference that your partner was in a long term monogamous relationship, it lowers his risk still further. If he was infected there was only an average chance of 1 in 1,000 that you caught it. And a single enlarged lymph node, if that's what the bump is, does not suggest HIV.
As a sexually active teen, you ought to be getting standard STD testing at least once a year, preferably every 6 months. Statistically, the main reason is for chlamydia, by far the most common STD in teens. But testing routinely should include gonorrhea, syphilis, and HIV as well. So if you haven't had such testing recently, do it now, since it's on your mind. But you can pretty much ignore HIV in relation to this particular exposure. No chance.
Since it's the wrong forum, there won't be any follow-up discussion. Best wishes.
HHH, MD
You're welcome. Stay safe.
Thank you Doctor for answering even though its in the wrong forum. I appreciate it alot.
I posted to the wrong forum. I'm sorry, I didn't know.