Our members have provided you answers to your questions.
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Magic_jay!! You never had a risk. You should have started with that. Oral sex is NOT a risk for HIV. Only vaginal or anal intercourse or sharing of IV drug needles. Oral sex has never resulted in a single documented case of HIV. Saliva and air inactivate the virus. So, your situation just drastically changed--- you never needed to test in the first place. All tests you take will be negative from an oral sex exposure an you should move on with your life.
What I am saying is that you have an autoimmune disorder, ulcerative colitis. It is unlikely but the medications you take for that (you say 4 of them) could theoretically cause your test to not be reliable. You should talk to your doctor about how the medications you take impact HIV testing. They may say you are fine and should move on. But because my understanding is that very rarely, an HIV test could be impacted, I'm not saying you are conclusive. Because I don't know. You probably ARE. But that's all I can really add and for further information, I'd talk to YOUR doctor. Even the doctor that treats the colitis.
Medication for ulcerative colitis if taken in large amounts could theoretically give a false positive or negative. You need to speak to your doctor about that. You can take a DNA PCR test. You should be working with your doctor if you had a true risk (as most written about here are not true risks --- only risk is unprotected vaginal or anal intercourse or sharing of IV drug needles) since you have the autoimmune issue of ulcerative colitis. Most likely it would not affect your test but I can't rule that out for you. So, you need to work with your doctor.
A 4th generation test is accurate 28 days after the last exposure, so you can trust your result. Whatever is causing your problem, is not HIV.
All the best.