Updates.
4 weeks later I took a blood test and the result were negative. Maybe still too early.
My ulcer is in my gum, it is round and painless... and it has white dot (pus my guess)
I think I'gonna visit the doctor Monday....
Guys don't be stupid like me and wear a condom...
No, on average it takes 21 days to show, sometimes longer. Not really sooner.
Thanks for your prompt response!
Well, I think it was Monday(night) instead of Wednesday that would make any difference?
Syphilis would not show that early and yes it would be too early to test.
I am not sure what the Dr could do with the sore.
Another question, if a doctor check my sore in my mouth can she/he test it under the microscope right away?