You had a 103° fever and didn't see a doctor?
Note for the future - if that happens again, that's an emergency, and you should see a doctor. How long did that last?
A single sore on your penis could be herpes. It could also be syphilis. It could be balanitis, or a host of other things. It might be nothing if it's hard to see. You need to see a doctor about it, though.
You don't say if the sex was unprotected or not. If it was, you should get tested for gonorrhea, chlamydia, mycoplasma, and NGU.
You can test for syphilis at 6 weeks. It's uncommon in most developed countries - the US, Canada, UK, Europe, etc., but you are in the time frame when a sore would develop, so get it looked at. If they say you can test now, go ahead and test.
If they think it's herpes, ask them to do a type specific culture or PCR swab on it. Don't let them just visually diagnose you.
I'm concerned about your fever. That's a really high fever.
Could you have had covid?