Will one get conclusive hiv test result on 30 days of exposure?

The standard HIV blood tests (for both HIV antigen and antibody, i.e. AgAb or "4th generation" tests) are almost conclusive at 30 days, but not quite; 6 weeks is necessary for a truly conclusive negative result.

Agree with Dr. H. If the result with a 4th gen combo test is positive, it is conclusive. A negative result needs to be repeated at 6 weeks after exposure. HIV is only one of the STDs. A condom may not protect against HPV, Herpes, LGV, syphilis, pubic lice etc. It would be prudent to see your doctor for an evaluation. Visit this site for information: https://www.cdc.gov/std/default.htm