If you want to be tested as thoroughly as possible, you'll need to be open about your sexual history, regardless of what it is. Ever had been on the receiving end of anal sex? Unless you tell them, they're unlikely to do a swab there. Similarly, if you want a throat swab, you need to tell them about the oral sex.
If 'a couple of weeks' means less than four, an HIV test won't be reliable regarding the latest incident, so you will probably need to go back for that at some point.