Thanks for ur answer sir.i am so much relieved now.:)
You didn't have any risk of hiv as your glans was covered, so you shouldn't have gone for an hiv test.
Oral sex exposes you to syphilis, gonorrhea and herpes. But, in the case of syphilis, your tongue should have touched the typical lesions of this bacterium, called "chancrus" easy to see. Regarding gonorrhea, there is normally a white discharge in the vagina. Talking about herpes, the infection occurs if you touch the lesions. If you didn't see any of them, probably she didn't have any of those sicknesses. Sometimes the chancrus can be inside the body, but as you used condom you couldn't have got any infection.
If you are concerned about the oral sex, even if it was brief, you could go to test for gonorrhea and syphilis, 3 weeks after the exposure for gonorrhea and 3-6 for syphilis. If you get negative for syphilis, it would be good to test again after three months, as there are people that take longer to show a positive result for syphilis.
But don't worry to much, your sex was protected, so everything should be fine.
All the best.
Dragon