I received unprotected oral sex. what are my chances of getting an std? had protected vaginal. i didn't preform oral.

Minimal: You could conceivably get herpes in this manner, and if the man had oral syphilitic lesions this could be transmitted, but unlikely. Most stds will not be transmitted by saliva which has enzymes which kill most organisms. If, however, your partner had a bleeding lesion then it is conceivable, but still not likely. If you are concerned always better to be tested and safe rather than sorry.