I need help i am very scared can you help me please?

In january i was at an escort and she gave me unprotected oral sex for 10 seconds or 15 seconds,then all was protected. I was and still i am very scared that i have an STD. I tested for HIV, Syphilis, Gonorrhea and Chlamydia 4 months after the sexual contact, and all were negative. But only the HIV test was correct because i took cefixime antibiotic at that time. I waited 3 weeks (the antibiotics got away from the body after 3 weeks?) and i tested again for Syphilis, Gonorrhea and Chlamydia and all are negative,but this time when i tested, i put liquid antibiotics on the acne from my face and back. This can affect the std testing?If i took vitamins, it can affect the std testing? If i didnt wash on my penis when i took the urine test for gonorrhea and Chlamydia test, and i touched a little bit the recipient with the penis can affect the urine test for those std's?

you are okuse this as a lesson to not frequent places like that

Are you sure? I need retesting?