A guy gave me oral sex. i'm a female. is there anything i can catch that way?

Yes: Many STIs, including chlamydia, gonorrhea, syphilis, and HIV can be spread through oral sex.

See below : Most people believe that oral sex is “safe” sex or not sex at all. But that is a misconception and having oral sex is risky sexual behavior that puts all participants involved in jeopardy of contracting a number of sexually transmitted diseases (STDs) and infections. These include: gonorrhea, chlamydia, genital herpes, syphilis, genital warts/HPV, hepatitis A, B and C, HIV, and pubic lice.

What's in his mouth: Although the possibility that you "can catch anything that way" is remote and the risk of oro-vaginal transmission of an infectious agent may be relatively small, some times, the mouth, lips, tongue, gums, oropharynx...can harbor a wide variety of microorganisms (viruses like herpes, some human papilloma viruses; fungi like monilia; bacterias like streps...etc) .