I wouldnt even get tested in your situation.
no need for testing if it was just oral
he had oral sex, so not really test nedeed, the PCR DNA HIV test does have a shorter window period of 15 days, but this test also have a false positive rate of 2-8% so its really high, just imaging how worried or desperate you will be if you had a false positive, a test at 6 weeks is 95% accurate, and at 3 months conclusive
You can take a PCR DNA HIV test which is very expensive and they can look for the virus not just antibodies. Since you are past the 2 week window period they can see if the virus is in you system.
3 months is when you can get your conclusive result.