The syphilis incubation period (the time from infection to symptoms) is 10-90 days, with the average of 21 days, so this could be syphilis.
Your test was too early to get an accurate result - it can take up to 90 days to get a positive result, though the average is 6 weeks. Since you have a sore, go back to the doctor and get it checked. You can test positive on a syphilis test as early as a week or two, but they may treat you anyway since you have symptoms.
They may be able to tell you that the sore isn't at all indicative of syphilis, so get it checked.
Your other tests were also done a little early. You can test positive for gonorrhea and NGU in as little as 3 days, but 5 is better. When you go back to the doctor, ask for repeat testing. Since you had oral sex, only gonorrhea and NGU are a concern - you won't get chlamydia and trich from oral. If they run those tests, it's fine. They are all often run together.
Let us know what happens.
Thank you for your answer. So here is my update:
My first post was written 14 days after exposure. I didnt mention that I had a full battery of tests on day 10. All came bag negative on day 18. Because of my testicular pain I went to a doc on day 17. I have got an ultrasound screening, urine test and swab test. Everthing was fine, results negative. Seems that it was just anxiety for this problem.
Now to the other problem: Due to your answer I went on day 19 to our local medical center. The doctor said not to worry. Syphilis is nearly extinct in Germany except for homosexual men. And even then it is almost transmitted through anal sex. I should not worry about syphilis and sex with my wife is no problem. Nevertheless a swab test and blood test was made. Results will come next week.
On day 24 I went to another specialist (urologist). We talked about my worries regarding syphilis and the circular thing. He exemined me and said that is how a healthy penis should look like. Only foreskin wrinkles are forming this shapes. Furthermore he said its nearly impossible to catch syphilis in Germany. He said, I just dont have it and should no think about it anymore.
So today is day 26. My mind calmed down a little bit. As a chancre did not develope by now, how likely it is it ever will?
Thanks for your answer auntie.
UPDATE: Today is day 32 after exposure. No physical symptomes appeard by now. I got the test results from day 20. All negative. The nightmare should be over by now. Doc reassured me that Im clean. I will do one last test on week 6 and post my update here.