If you correctly remember that you used protection and it did not fail, you have no reason to worry about. Oral sex has nothing to do with HIV transmission.
However if you don't, you gave to test after 6-7 weeks of exposure and a follow up test after another 6 weeks.PCR RNA test after 4 weeks could be highly reassuring but not conclusive, and for that, you have to go for Antibody tests as advised.
Next time, keep your one night stands away from alcohol, they are never in a good synergy. Choose only one out of the two, alcohol and a pertner of unknown status.
You never had an exposure in the situations you've provided.