Welcome to the Forum. By oral sex I presume that you mean that you received oral sex. There are few STDs that one would get from receipt of oral sex and of those which occur, most do cause symptoms when they occur. Most people exposed to infected partners still do not get infected, thus your overall risk, even before testing was quite low.
Had you gotten infected without symptoms, the microscope test will detect the vast majority of infections that are present but there are a very small chance that if an infection was present it might have been missed. the final word will be the laboratory tests.
I hope this comment is helpful to you. EWH
also what are the risk say if its 1 in 10000 for hiv then what is it for gnorrhea and chlymidia
he also took urine samples but i do not know what he did with these