Hi, the risk is really low.
UTI such as gonorrhea and chlamydia can be spread through oral sex, but it would usually require deepthroating as the bacteria usually resides at the back of the throat, the pharynx.
Other STDs such as herpes, hpv and syphilis can also be spread through oral sex. But all these stds require contact with sores in the mouth.
Anyway, ur risk is very low, there is no need to worry too much. U can get stds test for a peace of mind.