Oral sex exposes you to gonorrhea, syphilis and herpes, but the risk is really low, close to zero. But as you have a partner, it would be good to test. You can do it as follows:
-3 weeks after the exposure for gonorrhea.
-6 weeks after the exposure for syphilis, and if your result is negative, re-test 3 months after the encounter, as there are people that take longer to show a positive result.
-3 months after the exposure test for herpes.
All the best.